X+x+57=139

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Solution for X+x+57=139 equation: 



X+X+57=139

We move all terms to the left:

X+X+57-(139)=0

We add all the numbers together, and all the variables

2X-82=0

We move all terms containing X to the left, all other terms to the right

2X=82

X=82/2

X=41

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