4x=16
x=4
20% of 600
120
10% off of $100
10
3x-2=7
x=3
(-12)+(-15)
-27
15% of 30
4.5
12x-3=45
(-8)(-5)
-40
3(5x-7)+9x-6
24x-27
6x+4=7x+2
x=2
7x-12=4x+7
x=7