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-8x+91=-8+3x
We move all terms to the left:
-8x+91-(-8+3x)=0
We add all the numbers together, and all the variables
-8x-(3x-8)+91=0
We get rid of parentheses
-8x-3x+8+91=0
We add all the numbers together, and all the variables
-11x+99=0
We move all terms containing x to the left, all other terms to the right
-11x=-99
x=-99/-11
x=+9
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