10=21-y

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Solution for 10=21-y equation: 



10=21-y

We move all terms to the left:

10-(21-y)=0

We add all the numbers together, and all the variables

-(-1y+21)+10=0

We get rid of parentheses

1y-21+10=0

We add all the numbers together, and all the variables

y-11=0

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

y=11

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