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(68)x(1)x(-1)=-(-68)
We move all terms to the left:
(68)x(1)x(-1)-(-(-68))=0
We add all the numbers together, and all the variables
68x1x(-1)-68=0
We multiply parentheses
-68x-68=0
We move all terms containing x to the left, all other terms to the right
-68x=68
x=68/-68
x=-1
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