9-3=21+y

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Solution for 9-3=21+y equation: 



9-3=21+y

We move all terms to the left:

9-3-(21+y)=0

We add all the numbers together, and all the variables

-(y+21)+9-3=0

We add all the numbers together, and all the variables

-(y+21)+6=0

We get rid of parentheses

-y-21+6=0

We add all the numbers together, and all the variables

-1y-15=0

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

-y=15

y=15/-1

y=-15

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