Y=21+x

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Solution for Y=21+x equation: 



=21+Y

We move all terms to the left:

-(21+Y)=0

We add all the numbers together, and all the variables

-(Y+21)=0

We get rid of parentheses

-Y-21=0

We add all the numbers together, and all the variables

-1Y-21=0

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

-Y=21

Y=21/-1

Y=-21

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