X+2y=126

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Solution for X+2y=126 equation: 



X+2X=126

We move all terms to the left:

X+2X-(126)=0

We add all the numbers together, and all the variables

3X-126=0

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

3X=126

X=126/3

X=42

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