-21+9=y

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Solution for -21+9=y equation: 



-21+9=y

We move all terms to the left:

-21+9-(y)=0

We add all the numbers together, and all the variables

-1y-12=0

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

-y=12

y=12/-1

y=-12

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