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63=3x+4x
We move all terms to the left:
63-(3x+4x)=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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