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3x-18=-12-3x
We move all terms to the left:
3x-18-(-12-3x)=0
We add all the numbers together, and all the variables
3x-(-3x-12)-18=0
We get rid of parentheses
3x+3x+12-18=0
We add all the numbers together, and all the variables
6x-6=0
We move all terms containing x to the left, all other terms to the right
6x=6
x=6/6
x=1
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