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X+3X+(X-6)=149
We move all terms to the left:
X+3X+(X-6)-(149)=0
We add all the numbers together, and all the variables
4X+(X-6)-149=0
We get rid of parentheses
4X+X-6-149=0
We add all the numbers together, and all the variables
5X-155=0
We move all terms containing X to the left, all other terms to the right
5X=155
X=155/5
X=31
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