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x+3(x+2)=330
We move all terms to the left:
x+3(x+2)-(330)=0
We multiply parentheses
x+3x+6-330=0
We add all the numbers together, and all the variables
4x-324=0
We move all terms containing x to the left, all other terms to the right
4x=324
x=324/4
x=81
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