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-108+x=7x+42
We move all terms to the left:
-108+x-(7x+42)=0
We get rid of parentheses
x-7x-42-108=0
We add all the numbers together, and all the variables
-6x-150=0
We move all terms containing x to the left, all other terms to the right
-6x=150
x=150/-6
x=-25
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