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