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-3x-91=5x+45
We move all terms to the left:
-3x-91-(5x+45)=0
We get rid of parentheses
-3x-5x-45-91=0
We add all the numbers together, and all the variables
-8x-136=0
We move all terms containing x to the left, all other terms to the right
-8x=136
x=136/-8
x=-17
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