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-2x-18=8x+42
We move all terms to the left:
-2x-18-(8x+42)=0
We get rid of parentheses
-2x-8x-42-18=0
We add all the numbers together, and all the variables
-10x-60=0
We move all terms containing x to the left, all other terms to the right
-10x=60
x=60/-10
x=-6
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