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18+3x+(45-3x)=63
We move all terms to the left:
18+3x+(45-3x)-(63)=0
We add all the numbers together, and all the variables
3x+(-3x+45)+18-63=0
We add all the numbers together, and all the variables
3x+(-3x+45)-45=0
We get rid of parentheses
3x-3x+45-45=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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