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2x-x=-8+7
x=-1
b) 3x-9=x-11
3x-x=-11+9
2x=-2
x=-2/2
x=-1
c) 5x-4=8x-20
-3x=-16
x=16/3
d) 13x-4=-6x+17
19x=21
x=21/19
e) 39-15x=-31-5x
-10x=-70
x=70/10
x=7
f) x+1=18x-1
-17x=-2
x=2/17
g) 120+36x+-12x
24x=-120
x=-120/24
x=-5
h) -x+15=5x-45
-6x=-60
x=60/6
x=10