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X-31=75-X
We move all terms to the left:
X-31-(75-X)=0
We add all the numbers together, and all the variables
X-(-1X+75)-31=0
We get rid of parentheses
X+1X-75-31=0
We add all the numbers together, and all the variables
2X-106=0
We move all terms containing X to the left, all other terms to the right
2X=106
X=106/2
X=53
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