12=20-y

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Solution for 12=20-y equation: 



12=20-y

We move all terms to the left:

12-(20-y)=0

We add all the numbers together, and all the variables

-(-1y+20)+12=0

We get rid of parentheses

1y-20+12=0

We add all the numbers together, and all the variables

y-8=0

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

y=8

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