20=50-y

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Solution for 20=50-y equation: 



20=50-y

We move all terms to the left:

20-(50-y)=0

We add all the numbers together, and all the variables

-(-1y+50)+20=0

We get rid of parentheses

1y-50+20=0

We add all the numbers together, and all the variables

y-30=0

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

y=30

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