X+2*y=402

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Solution for X+2*y=402 equation: 



X+2X=402

We move all terms to the left:

X+2X-(402)=0

We add all the numbers together, and all the variables

3X-402=0

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

3X=402

X=402/3

X=134

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