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-85=7x+6
We move all terms to the left:
-85-(7x+6)=0
We get rid of parentheses
-7x-6-85=0
We add all the numbers together, and all the variables
-7x-91=0
We move all terms containing x to the left, all other terms to the right
-7x=91
x=91/-7
x=-13
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