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15(8x-31)=615
We move all terms to the left:
15(8x-31)-(615)=0
We multiply parentheses
120x-465-615=0
We add all the numbers together, and all the variables
120x-1080=0
We move all terms containing x to the left, all other terms to the right
120x=1080
x=1080/120
x=9
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