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3x-15=-5x-17
We move all terms to the left:
3x-15-(-5x-17)=0
We get rid of parentheses
3x+5x+17-15=0
We add all the numbers together, and all the variables
8x+2=0
We move all terms containing x to the left, all other terms to the right
8x=-2
x=-2/8
x=-1/4
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