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18=3+x-9-3x
We move all terms to the left:
18-(3+x-9-3x)=0
We add all the numbers together, and all the variables
-(-2x-6)+18=0
We get rid of parentheses
2x+6+18=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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