X+y+y=138

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Solution for X+y+y=138 equation: 



X+X+X=138

We move all terms to the left:

X+X+X-(138)=0

We add all the numbers together, and all the variables

3X-138=0

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

3X=138

X=138/3

X=46

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