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63=7+x
We move all terms to the left:
63-(7+x)=0
We add all the numbers together, and all the variables
-(x+7)+63=0
We get rid of parentheses
-x-7+63=0
We add all the numbers together, and all the variables
-1x+56=0
We move all terms containing x to the left, all other terms to the right
-x=-56
x=-56/-1
x=+56
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