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(x+-6x)=84
We move all terms to the left:
(x+-6x)-(84)=0
We add all the numbers together, and all the variables
(-5x)-84=0
We get rid of parentheses
-5x-84=0
We move all terms containing x to the left, all other terms to the right
-5x=84
x=84/-5
x=-16+4/5
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