X+2y=129

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Solution for X+2y=129 equation: 



X+2X=129

We move all terms to the left:

X+2X-(129)=0

We add all the numbers together, and all the variables

3X-129=0

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

3X=129

X=129/3

X=43

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