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91=6x+3x-8
We move all terms to the left:
91-(6x+3x-8)=0
We add all the numbers together, and all the variables
-(9x-8)+91=0
We get rid of parentheses
-9x+8+91=0
We add all the numbers together, and all the variables
-9x+99=0
We move all terms containing x to the left, all other terms to the right
-9x=-99
x=-99/-9
x=+11
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