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