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63=15+x
We move all terms to the left:
63-(15+x)=0
We add all the numbers together, and all the variables
-(x+15)+63=0
We get rid of parentheses
-x-15+63=0
We add all the numbers together, and all the variables
-1x+48=0
We move all terms containing x to the left, all other terms to the right
-x=-48
x=-48/-1
x=+48
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