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X+(X+70)+(X+70+80)=1274
We move all terms to the left:
X+(X+70)+(X+70+80)-(1274)=0
We add all the numbers together, and all the variables
X+(X+70)+(X+150)-1274=0
We get rid of parentheses
X+X+X+70+150-1274=0
We add all the numbers together, and all the variables
3X-1054=0
We move all terms containing X to the left, all other terms to the right
3X=1054
X=1054/3
X=351+1/3
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