-12 (x-5) + 7(3-x) =5

-12x + 60 + 21 -7x =5

x(-12-7) + 81 =5

-19x = -76

x= 4

\(-12\left(x-5\right)+7\left(3-x\right)=5\)

\(\Rightarrow-12x-\left(-60\right)+21-7x=5\)

\(\Rightarrow-12x-7x+60+21=5\)

\(\Rightarrow-19x=5-60-21\)

\(\Rightarrow-19x=-76\)

\(\Rightarrow x=\frac{-76}{-19}=4\)

                 -12 . (x - 5) + 7 . (3 - x) = 5

                -12x + 60 + 21 - 7x = 5

                x . (-12 - 7) + 81 = 5

                x . (-19) = 5 - 81

                x . (-19) = -76

                x = -76 : (-19)

                x = 4

              Vậy x = 4

          Ủng hộ mk nha !!! ^_^

\(a,x-1⋮x-3\)

\(\Rightarrow x-3+2⋮x-3\)

\(\Rightarrow2⋮x-3\)

\(x-3=\left\{-2;-1;1;2\right\}\)

\(x=\left\{1;2;4;5\right\}\)

\(b,x+6⋮x-1\)

\(\Rightarrow x-1+7⋮x-1\)

\(\Rightarrow7⋮x-1\)

\(x=\left\{-6;0;2;8\right\}\)

\(c,x⋮x-5\)

\(x-5+5⋮x-5\)

\(5⋮x-5\)

\(x=\left\{0;4;6;11\right\}\)

\(a,-12.\left(x-5\right)+7.\left(-x+3\right)=5\)

                  \(-12x+60-7x+21=5\)

                                        \(-19x+81=5\)

                                                   \(-19x=5-81\)

                                                   \(-19x=-76\)

                                                            \(x=4\)

\(b,30.\left(x+2\right)-6.\left(x-5\right)-24.x=100\)

             \(30x+60-6x+30-24x=100\)

                                                  \(0x+90=100\)

                                                             \(0x=100-90\)

                                                             \(0x=10\)

=> ko có giá trị nào thõa mãn x 

cong chua xinh xan oi,cam on nhieu nha

 o0oNguyễno0o bn giúp mk nha bài này khó wa

 Harry Potter05 giúp mk đc ko vậy bn!!!

 o0oNguyễno0o giúp mk nhanh ik nha

a, số x = 0

b, x : 4 = 5 dư 3

x = 5 x 4 ( dư 3 )

x = 20 + 3

x = 23

a , x : 9 = x

x : 9 = 9

x = 9 x 9 = 81

b, x : 4 = 5 dư 3

x : 4 = 8

x = 8 x 4

= 32

a, Vì x : 9 = x . Nên x = 0 vì 0 chia số nào cũng bằng 0

b, x : 4 = 5 ( dư 3 )

    x     = 5 x 4 ( dư 3 )

    x    = 20 + 3

    x    = 23

các bn lm đến đâu cx dc miễn là lm hộ mk cái ạ, ai đang lm vào nhắn tin vs mk để mk bít nha

a; \(-\dfrac{8}{3}+\dfrac{7}{5}-\dfrac{71}{15}< x< -\dfrac{13}{7}+\dfrac{19}{14}-\dfrac{7}{2}\)

              -\(\dfrac{19}{15}\) - \(\dfrac{71}{15}\) < \(x\) < -\(\dfrac{1}{2}\) - \(\dfrac{7}{2}\)

              -6 < \(x\) < -4

             vì \(x\) \(\in\) Z nên \(x\) = -5

- \(\dfrac{19}{6}+\dfrac{-15}{2}+\dfrac{11}{3}\) < \(x\) < - \(\dfrac{5}{4}\) + \(\dfrac{19}{12}\) - \(\dfrac{10}{3}\)

- \(\dfrac{32}{3}+\dfrac{11}{3}< x< \) \(\dfrac{1}{3}\) - \(\dfrac{10}{3}\)

-7 < \(x\) < - 3

Vì \(x\in\) Z nên \(x\in\) {-6;-5;-4}

đây bạn

\(/x-\frac{1}{2}/=\frac{1}{3}\\ =>\orbr{\begin{cases}x-\frac{1}{2}=\frac{1}{3}\\x-\frac{1}{2}=-\frac{1}{3}\end{cases}}\\ =>\orbr{\begin{cases}x=\frac{1}{3}+\frac{1}{2}\\x=-\frac{1}{3}+\frac{1}{2}\end{cases}}\\ =>\orbr{\begin{cases}x=\frac{5}{6}\\x=\frac{1}{6}\end{cases}}\)

\(a,|x-\frac{1}{2}|=\frac{1}{3}\)

\(\Rightarrow\orbr{\begin{cases}x-\frac{1}{2}=\frac{1}{3}\\x-\frac{1}{2}=-\frac{1}{3}\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{5}{6}\\x=\frac{1}{6}\end{cases}}}\)

\(b,\frac{14}{15}:\frac{9}{10}=x:\frac{3}{7}\)

\(\frac{28}{27}=x:\frac{3}{7}\)

\(x=\frac{4}{9}\)

\(c,\frac{6}{5}:8=\frac{2}{5}:x\)

\(\frac{3}{20}=\frac{2}{5}:x\)

\(x=\frac{8}{3}\)

\(d,3x-\frac{7}{8}=\frac{5}{2}\)

\(3x=\frac{27}{8}\)

\(x=\frac{9}{8}\)

mình chịu

\(5+x-3=5-\left(x+4\right)\)

\(5+x-3=5-x-4\)

\(x+x=5-4-5+3\)

\(2x=-1\)

\(x=\frac{-1}{2}\)

vay \(x=\frac{-1}{2}\)

\(x-\left(5.\left|-7\right|+3\right)=\left|-8\right|+6-2\)

\(x-\left(5.7+3\right)=8+6-2\)

\(x-38=12\)

\(x=12+38\)

\(x=50\)

vay \(x=50\)

\(\left|x-3\right|+7=0\)

\(\left|x-3\right|=-7\)( ko ton tai)

\(12-3\left|x-1\right|=6\)

\(3\left|x-1\right|=6\)

\(\left|x-1\right|=2\)

\(\Rightarrow\orbr{\begin{cases}x-1=2\\x-1=-2\end{cases}}\Rightarrow\orbr{\begin{cases}x=3\\x=-1\end{cases}}\)

                  vay \(\orbr{\begin{cases}x=3\\x=-1\end{cases}}\)