21y-12y-12=-30

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Solution for 21y-12y-12=-30 equation: 



21y-12y-12=-30

We move all terms to the left:

21y-12y-12-(-30)=0

We add all the numbers together, and all the variables

9y+18=0

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

9y=-18

y=-18/9

y=-2

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