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-18-15x=15x+12
We move all terms to the left:
-18-15x-(15x+12)=0
We get rid of parentheses
-15x-15x-12-18=0
We add all the numbers together, and all the variables
-30x-30=0
We move all terms containing x to the left, all other terms to the right
-30x=30
x=30/-30
x=-1
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