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x+x+(x-350)=1297
We move all terms to the left:
x+x+(x-350)-(1297)=0
We add all the numbers together, and all the variables
2x+(x-350)-1297=0
We get rid of parentheses
2x+x-350-1297=0
We add all the numbers together, and all the variables
3x-1647=0
We move all terms containing x to the left, all other terms to the right
3x=1647
x=1647/3
x=549
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