3y-12=-21

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Solution for 3y-12=-21 equation: 



3y-12=-21

We move all terms to the left:

3y-12-(-21)=0

We add all the numbers together, and all the variables

3y+9=0

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

3y=-9

y=-9/3

y=-3

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