3y-21=-7y+12

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Solution for 3y-21=-7y+12 equation: 



3y-21=-7y+12

We move all terms to the left:

3y-21-(-7y+12)=0

We get rid of parentheses

3y+7y-12-21=0

We add all the numbers together, and all the variables

10y-33=0

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

10y=33

y=33/10

y=3+3/10

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