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18=-12+5x
We move all terms to the left:
18-(-12+5x)=0
We add all the numbers together, and all the variables
-(5x-12)+18=0
We get rid of parentheses
-5x+12+18=0
We add all the numbers together, and all the variables
-5x+30=0
We move all terms containing x to the left, all other terms to the right
-5x=-30
x=-30/-5
x=+6
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