X+2y+3y=20

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Solution for X+2y+3y=20 equation: 



X+2X+3X=20

We move all terms to the left:

X+2X+3X-(20)=0

We add all the numbers together, and all the variables

6X-20=0

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

6X=20

X=20/6

X=3+1/3

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