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5x-18=15x-12
We move all terms to the left:
5x-18-(15x-12)=0
We get rid of parentheses
5x-15x+12-18=0
We add all the numbers together, and all the variables
-10x-6=0
We move all terms containing x to the left, all other terms to the right
-10x=6
x=6/-10
x=-3/5
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