Question

Tìm x ; 2x + 12=3.(x-7)

Ai trả lời đc mình sẽ tick cho

Answer 1

Ta có : 2x + 12 = 3 . ( x - 7 )

           2x + 12 =  3x - 3 . 7 

           2x + 12 = 3x -21 

           2x + 12 + 21 = 3x 

           2x  + 33       = 3x 

                    33       =  3x - 2x 

                    x         = 33

Answer 2

\(2x+12=3\left(x-7\right)\)

\(\Leftrightarrow\)\(2x+12=3x-21\)

\(\Leftrightarrow\)\(3x-2x=12+21\)

\(\Leftrightarrow\)\(x=33\)

Vậy \(x=33\)

Answer 3

2x + 12 = 3 ( x - 7 )

2x + 12 = 3x - 21

2x - 3 x = -12 - 21

- 1x = - 33

x = - 33 : ( - 1 )

x = 33

Answer 4

2x + 12 = 3.( x - 7 )

2x + 12 = 3x - 21

12 + 21 = 3x - 2x

        33 = x

Vậy x = 33

Answer 5

\(2x+12=3\left(x-7\right)\)

\(\Rightarrow2x+12=3x-21\)

\(\Rightarrow2x-3x=-21-12\)

\(\Rightarrow-x=-33\)

\(\Rightarrow x=33\)

Vậy x = 33

Answer 6

2x+12=3.x-3.7

2x+12=3x-21

3x-2x=12-(-21)

x(3-2)=33

x.1=33

x=33:1

x=33

sai thì sai mà đúng thì k nha

Answer 7

2x + 12 = 3.( x - 7 )

2x + 12 = 3x - 21

2x - 3x = - 21 - 12

- 1x = - 33

x = - 33 : ( - 1 )

x = 33

Answer 8

Trả lời:

2x + 12 = 3(x-7)

2x + 12 = 3x - 21

3x - 2x  = 12 + 21

x          = 33

Vậy x = 33

Hok tốt!

Vuong Dong Yet

Answer 9

2x + 12 = 3 . ( x - 7 )

=> 2x + 12 =  3x - 3 . 7

=> 2x + 12 = 3x - 21

=> 2x + 12 + 21 = 3x

=> 2x + 33 = 3x

=> 33 = 3x - 2x

=> x = 33

Vậ x = 33