Evaluate the expressions.

4x + 12 = 36

2x+9=5x

3 (2x+1) = 15

1) 4x=36-12

4x=24

x=6

4 divided by 24 is 6

2) Like terms are involved in this

2x+9=5x

2x-5x=-9 they would change signs because they are moving to the oppisite side

-3x=-9

x=3

3) 3 (2x+1) = 15

6x+3=15

6x=15-3

6x=12

x=2