Question

Tìm x, biết :

3 . ( 4 - 2x ) = x + 15

Answer 1

3 . ( 4 - 2x ) = x + 15

=> 12 - 6x = x + 15

=> - 6x - x = 15 - 12

=> - 7x = 3

=> x = 3 : ( - 7 )

=> \(x=\frac{3}{-7}\)

Answer 2

3.(4 - 2x )             = x +15

=> ( 3.4 ) - (3.2x) = x+15

=> 12 - 6x            = x+15

=> -6x - x             =15 -12

=> -7x                  =3

=> x                     =3:(-7)