-2y+-9=-21

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Solution for -2y+-9=-21 equation: 



-2y+-9=-21

We move all terms to the left:

-2y+-9-(-21)=0

We add all the numbers together, and all the variables

-2y+12=0

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

-2y=-12

y=-12/-2

y=+6

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