3y-21=-6

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Solution for 3y-21=-6 equation: 



3y-21=-6

We move all terms to the left:

3y-21-(-6)=0

We add all the numbers together, and all the variables

3y-15=0

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

3y=15

y=15/3

y=5

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