Question

3x + 9x= 6x + 42 i would also like an explanation

Answer 1

x=7

Explanation:

3x+9x=6x+42 add simalar elements 3x+9x=12x

12x=6x+42

12x-6x=6x+42-6x subract 6x from both sides

6x=42 simplify

6x/6=42/6 divide both by 6

x=7