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63=7+8z
We move all terms to the left:
63-(7+8z)=0
We add all the numbers together, and all the variables
-(8z+7)+63=0
We get rid of parentheses
-8z-7+63=0
We add all the numbers together, and all the variables
-8z+56=0
We move all terms containing z to the left, all other terms to the right
-8z=-56
z=-56/-8
z=+7
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