5x+3(10-x)+x=45

<=> 5x+30-3x+x=45

<=>3x+30=45

<=>3x=15

<=>x=5

5x+3(10-x)+x=45 
6x+3(10-x)=45 
2x+10-x=15 
x+10=15 
x=15-10 
x=5

5x+30-3x+x=45

5x-3x+x=15

x(5-3+1)=15

x.3=15

x=5

5x+3.(10-x)+x=45

5x+30-3x+x=45

3x+30=45

3x    =15

x  =   5

X=5 ai thích thì k hộ mik nha!

\(5x+30-3x+x=45\Rightarrow3x+30=45\Rightarrow x=5\)

phương trình đơn giản vậy mà không biết giải , ngố quá

5x+30-3x+x=45

5x-3x+x+30=45

x(5-3+1)=15

x.3=15

x=5

vậy x=5

5x + 3 . ( 10 - x ) + x = 45

5x + 30 - 3x + x = 45

( 5x - 3x + x ) +30 = 45

3x = 45 - 30

3x = 15 => x = 5

=> 6x + 3(10 - x) = 45

=> 6x + 30 - 3x = 45

=> 3x + 30 = 45

=> 3x = 15

=> x = 5

5x+3(10-x)+x=45

5x+x+3(10-x)=45

6x+3(10-x)=45

phân phối:

6x+3.10-3x=45

6x+30-3x=45

6x-3x+30=45

3x+30=45

3x=45-30

3x=15

x=15/3

Vậy x=5

5x + 3( 10- x ) + x = 45

\(\Rightarrow5x+30-3x+x=45\)

\(\Rightarrow3x+30=45\)

\(\Rightarrow3x=15\)

\(\Rightarrow x=5\)

                   5x+3(10-x)+x=45

                     5x+30x+x=45

                    5x-3x+x= 45-30

                      x(5-3+1)=15

                     x=15:3

                   x=5

Vậy x =5

Trần Đồng Khắc Việt ơi bn giải thích cho mik bài toán này đi

1) 3x = 45 + 15 = 60

x = 60 : 3 = 20

2) 5x = 50 - 35 = 15

x = 15 : 5 = 3

3) (2x - 5) + 17 = 6

2x - 5 = 6 - 17

2x - 5 = -11

2x = -11 + 5

2x = -6

x = -6 : 2 = -3

4) 10 - 2(4 -3x) = -4

2(4 - 3x) = -4 - 10 = -14

4 - 3x = -14 : 2 = -7

3x = -7 - 4 = -18

x = -18 : 3 = -6

\(\left\{{}\begin{matrix}\left\{{}\begin{matrix}3x-15=45\Leftrightarrow3x=60\Leftrightarrow x=20\\35-5x=50\Leftrightarrow5x=-15\Leftrightarrow x=-3\end{matrix}\right.\\\left\{{}\begin{matrix}\left(2x-5\right)+17=6\Leftrightarrow2x+5=-11\Leftrightarrow2x=-16\Leftrightarrow x=-8\\10-2\left(4-3x\right)=-4\Leftrightarrow8-6x=14\Leftrightarrow6x=-6\Leftrightarrow x=-1\end{matrix}\right.\\\left\{{}\begin{matrix}-12+3\left(-x+7\right)=-18\Leftrightarrow-3x+21=-6\Leftrightarrow-3x=-27\Leftrightarrow x=9\\24:\left(3x-2\right)=-3\Leftrightarrow3x-2=-8\Leftrightarrow3x=-6\Leftrightarrow x=-2\end{matrix}\right.\\-45:5\left(-3-2x\right)=3\Leftrightarrow-15-10x=-15\Leftrightarrow10x=0\Leftrightarrow x=0\end{matrix}\right.\)