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3x-55=8x-15
We move all terms to the left:
3x-55-(8x-15)=0
We get rid of parentheses
3x-8x+15-55=0
We add all the numbers together, and all the variables
-5x-40=0
We move all terms containing x to the left, all other terms to the right
-5x=40
x=40/-5
x=-8
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