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x+3(2x+4)=18
We move all terms to the left:
x+3(2x+4)-(18)=0
We multiply parentheses
x+6x+12-18=0
We add all the numbers together, and all the variables
7x-6=0
We move all terms containing x to the left, all other terms to the right
7x=6
x=6/7
x=6/7
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