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-8+7x=-6x-99
We move all terms to the left:
-8+7x-(-6x-99)=0
We get rid of parentheses
7x+6x+99-8=0
We add all the numbers together, and all the variables
13x+91=0
We move all terms containing x to the left, all other terms to the right
13x=-91
x=-91/13
x=-7
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