Answer:
x-8= -3x+12
adding 8 and 3x on both sides
x-8+8+3x= -3x+3x+12+8
x+3x=20
4x=20 divide by 4
x=5
x+12= -x-6
adding x and subtacating 12 on both sides
x+x+12-12= -x+x-6-12
2x = -18 divide by 2
x= -9
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