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7-(7x-63)=7
We move all terms to the left:
7-(7x-63)-(7)=0
We add all the numbers together, and all the variables
-(7x-63)=0
We get rid of parentheses
-7x+63=0
We move all terms containing x to the left, all other terms to the right
-7x=-63
x=-63/-7
x=+9
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