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X+(X+3)+(X+4)=134
We move all terms to the left:
X+(X+3)+(X+4)-(134)=0
We get rid of parentheses
X+X+X+3+4-134=0
We add all the numbers together, and all the variables
3X-127=0
We move all terms containing X to the left, all other terms to the right
3X=127
X=127/3
X=42+1/3
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