I think this is the answer. i havent done any math for a while.
Answer:

Step-by-step explanation:
5x-12=3x+20
plus 12 both sides
5x=3x+32
-3x both sides
2x=32
divide by 2 both sides
x=16
Answer:
18
Step-by-step explanation:

That will give you 18 which is the answer
Answer:
15 + .5x = 25
Step-by-step explanation:
.5x = 10
x = 20
Okay , wheres the questions at tho...?