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X+2X+(2X+6)=91
We move all terms to the left:
X+2X+(2X+6)-(91)=0
We add all the numbers together, and all the variables
3X+(2X+6)-91=0
We get rid of parentheses
3X+2X+6-91=0
We add all the numbers together, and all the variables
5X-85=0
We move all terms containing X to the left, all other terms to the right
5X=85
X=85/5
X=17
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