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(X+X)+X=57
We move all terms to the left:
(X+X)+X-(57)=0
We add all the numbers together, and all the variables
(+2X)+X-57=0
We add all the numbers together, and all the variables
X+(+2X)-57=0
We get rid of parentheses
X+2X-57=0
We add all the numbers together, and all the variables
3X-57=0
We move all terms containing X to the left, all other terms to the right
3X=57
X=57/3
X=19
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