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x+3(x-2)=6x+18
We move all terms to the left:
x+3(x-2)-(6x+18)=0
We multiply parentheses
x+3x-(6x+18)-6=0
We get rid of parentheses
x+3x-6x-18-6=0
We add all the numbers together, and all the variables
-2x-24=0
We move all terms containing x to the left, all other terms to the right
-2x=24
x=24/-2
x=-12
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