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2x+3(x+2)=18
We move all terms to the left:
2x+3(x+2)-(18)=0
We multiply parentheses
2x+3x+6-18=0
We add all the numbers together, and all the variables
5x-12=0
We move all terms containing x to the left, all other terms to the right
5x=12
x=12/5
x=2+2/5
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