-2y-3(9)=-21

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Solution for -2y-3(9)=-21 equation: 



-2y-3(9)=-21

We move all terms to the left:

-2y-3(9)-(-21)=0

We add all the numbers together, and all the variables

-2y-18=0

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

-2y=18

y=18/-2

y=-9

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