How do you solve 12 + 3x = 30?

1 Answer
Jul 28, 2016

x = 6

Explanation:

color(coral)("Subtract 12 on both sides:")

cancel12+3x= 30
-cancel12 color(white)(aa) -12

12 cancels out on the left side, and when you subtract 12 from 30 on the right you get 18:

3x= 18

color(green)("Divide both sides 3 to get x by itself.")

(cancel"3"x)/cancel3=(18)/3

Now you are just left with x on the left side and 6 on the right side.

Thus,
color(puroke)"x = 6"