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X=72+3X
We move all terms to the left:
X-(72+3X)=0
We add all the numbers together, and all the variables
X-(3X+72)=0
We get rid of parentheses
X-3X-72=0
We add all the numbers together, and all the variables
-2X-72=0
We move all terms containing X to the left, all other terms to the right
-2X=72
X=72/-2
X=-36
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