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63=5x+4x
We move all terms to the left:
63-(5x+4x)=0
We add all the numbers together, and all the variables
-(+9x)+63=0
We get rid of parentheses
-9x+63=0
We move all terms containing x to the left, all other terms to the right
-9x=-63
x=-63/-9
x=+7
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