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263-17x=15x+7
We move all terms to the left:
263-17x-(15x+7)=0
We get rid of parentheses
-17x-15x-7+263=0
We add all the numbers together, and all the variables
-32x+256=0
We move all terms containing x to the left, all other terms to the right
-32x=-256
x=-256/-32
x=+8
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