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2x+6(x+1)+9=111
We move all terms to the left:
2x+6(x+1)+9-(111)=0
We add all the numbers together, and all the variables
2x+6(x+1)-102=0
We multiply parentheses
2x+6x+6-102=0
We add all the numbers together, and all the variables
8x-96=0
We move all terms containing x to the left, all other terms to the right
8x=96
x=96/8
x=12
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