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X+(2X-3)=30
We move all terms to the left:
X+(2X-3)-(30)=0
We get rid of parentheses
X+2X-3-30=0
We add all the numbers together, and all the variables
3X-33=0
We move all terms containing X to the left, all other terms to the right
3X=33
X=33/3
X=11
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