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X+(-3X)=16
We move all terms to the left:
X+(-3X)-(16)=0
We get rid of parentheses
X-3X-16=0
We add all the numbers together, and all the variables
-2X-16=0
We move all terms containing X to the left, all other terms to the right
-2X=16
X=16/-2
X=-8
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