X+2y=81

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Solution for X+2y=81 equation: 



X+2X=81

We move all terms to the left:

X+2X-(81)=0

We add all the numbers together, and all the variables

3X-81=0

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

3X=81

X=81/3

X=27

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