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X+(X-28)=100
We move all terms to the left:
X+(X-28)-(100)=0
We get rid of parentheses
X+X-28-100=0
We add all the numbers together, and all the variables
2X-128=0
We move all terms containing X to the left, all other terms to the right
2X=128
X=128/2
X=64
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