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(4x)-(8x)-(15)=(-63)
We move all terms to the left:
(4x)-(8x)-(15)-((-63))=0
We add all the numbers together, and all the variables
-4x+48=0
We move all terms containing x to the left, all other terms to the right
-4x=-48
x=-48/-4
x=+12
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