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8(x+2)+(2x-5)=91
We move all terms to the left:
8(x+2)+(2x-5)-(91)=0
We multiply parentheses
8x+(2x-5)+16-91=0
We get rid of parentheses
8x+2x-5+16-91=0
We add all the numbers together, and all the variables
10x-80=0
We move all terms containing x to the left, all other terms to the right
10x=80
x=80/10
x=8
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