Question

i giup mk lan Bai nay voi !

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

mk se tick cho ai nhanh nhat !

 

Answer 1

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

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

x(-12-7) + 81 =5

-19x = -76

x= 4

Answer 2

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

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

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

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

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

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

Answer 3

                 -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 !!! ^_^