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3x+15=8x+40
We move all terms to the left:
3x+15-(8x+40)=0
We get rid of parentheses
3x-8x-40+15=0
We add all the numbers together, and all the variables
-5x-25=0
We move all terms containing x to the left, all other terms to the right
-5x=25
x=25/-5
x=-5
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