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