Question

Como resolver a equação 3(2x+12)=21-3x

Answer 1

3(2x+12)=21-3x
6x+36=21-3x
6x+3x=21-36
9x=-15
x=-15/9
x=-1,66..

Answer 2

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

6 x + 3 6 = 2 1 - 3 x

6 x + 3 6 - 2 1 = - 3 x

6 x + 1 5 = - 3 x

1 5 = - 3 x - 6 x

1 5 = - 9 x

x=-15/9

x=-5/3