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X+3X+(7X-6)=511
We move all terms to the left:
X+3X+(7X-6)-(511)=0
We add all the numbers together, and all the variables
4X+(7X-6)-511=0
We get rid of parentheses
4X+7X-6-511=0
We add all the numbers together, and all the variables
11X-517=0
We move all terms containing X to the left, all other terms to the right
11X=517
X=517/11
X=47
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