Question

Show all work
3x + 12 = 30

Answer 1

6

Explanation:

instead of adding, we can use subtraction as our inverse operation

30 - 12 = 18.

to check, we can add 12 and 18 and see what we get.

12+ 18 = 30

Therefor, we are left with 18, but the equation is 3x + 12 = 30. not x + 12 = 30...

so, do 18 divided by 3 and you get 6!

6 = x

Answer 2

x = 6

Explanation:

write it out,

3x + 12 = 30

-12 -12

3x = 18

3x/3 18/3

x = 6