addition
x+5=9
x=4
x-6=11
x=17
2x=14
x=7
x/3=9
x=27
x-8=10
x=18
x+49=60
x=11
x-18=32
x=50
7x=42
x=6
x/8=8
x=64
4x=28
x=7
15=x+7
x=8
3=x-15
x=18
72=8x
x=9
3=x/11
x=33
45=x/10
x=450
x+4=-2
x=-6
x-7=-5
x=2
12x=-36
x=-3
x/6=-5
x=-30
x+9=-3
x=-12
x+(-15)=15
x=30
x-(-20)=40
x=20
-0.02=2x
x=-0.01
x/0.1=20
x=2
x/300,000=0
x=0