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2x-8=x-12
x=-4
b)10-2+2x+6x+15=2x+10+1
8x+23=2x+11
6x=-12
x=-0.5
c)8-3x-8+2x+10=3x+3-1
-x+10=3x+2
-4x=-8
x=2
d)1-2x-6x-15+3x=x+4
-5x-14=x+4
-6x=18
x=-3