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X+(3X-20)=500
We move all terms to the left:
X+(3X-20)-(500)=0
We get rid of parentheses
X+3X-20-500=0
We add all the numbers together, and all the variables
4X-520=0
We move all terms containing X to the left, all other terms to the right
4X=520
X=520/4
X=130
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