X+80y=390

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Solution for X+80y=390 equation: 



X+80X=390

We move all terms to the left:

X+80X-(390)=0

We add all the numbers together, and all the variables

81X-390=0

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

81X=390

X=390/81

X=4+22/27

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