20=171-y

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Solution for 20=171-y equation: 



20=171-y

We move all terms to the left:

20-(171-y)=0

We add all the numbers together, and all the variables

-(-1y+171)+20=0

We get rid of parentheses

1y-171+20=0

We add all the numbers together, and all the variables

y-151=0

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

y=151

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