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X+(3X-16)=90
We move all terms to the left:
X+(3X-16)-(90)=0
We get rid of parentheses
X+3X-16-90=0
We add all the numbers together, and all the variables
4X-106=0
We move all terms containing X to the left, all other terms to the right
4X=106
X=106/4
X=26+1/2
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