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(X+6.8)+X=717.2
We move all terms to the left:
(X+6.8)+X-(717.2)=0
We add all the numbers together, and all the variables
X+(X+6.8)-717.2=0
We get rid of parentheses
X+X+6.8-717.2=0
We add all the numbers together, and all the variables
2X-710.4=0
We move all terms containing X to the left, all other terms to the right
2X=710.4
X=710.4/2
X=355+0.39999999999998/2
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