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8x+42=-8x-42
We move all terms to the left:
8x+42-(-8x-42)=0
We get rid of parentheses
8x+8x+42+42=0
We add all the numbers together, and all the variables
16x+84=0
We move all terms containing x to the left, all other terms to the right
16x=-84
x=-84/16
x=-5+1/4
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