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3x+15=-5x+40
We move all terms to the left:
3x+15-(-5x+40)=0
We get rid of parentheses
3x+5x-40+15=0
We add all the numbers together, and all the variables
8x-25=0
We move all terms containing x to the left, all other terms to the right
8x=25
x=25/8
x=3+1/8
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