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(X-12)+(X-7.50)+X=63
We move all terms to the left:
(X-12)+(X-7.50)+X-(63)=0
We add all the numbers together, and all the variables
(X-12)+(X-7.5)+X-63=0
We add all the numbers together, and all the variables
X+(X-12)+(X-7.5)-63=0
We get rid of parentheses
X+X+X-12-7.5-63=0
We add all the numbers together, and all the variables
3X-82.5=0
We move all terms containing X to the left, all other terms to the right
3X=82.5
X=82.5/3
X=27+1/2
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