31-2y+y=20

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Solution for 31-2y+y=20 equation: 



31-2y+y=20

We move all terms to the left:

31-2y+y-(20)=0

We add all the numbers together, and all the variables

-1y+11=0

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

-y=-11

y=-11/-1

y=+11

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