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2x+9(x+1)=12
We move all terms to the left:
2x+9(x+1)-(12)=0
We multiply parentheses
2x+9x+9-12=0
We add all the numbers together, and all the variables
11x-3=0
We move all terms containing x to the left, all other terms to the right
11x=3
x=3/11
x=3/11
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