3y+21=6y+12

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Solution for 3y+21=6y+12 equation: 



3y+21=6y+12

We move all terms to the left:

3y+21-(6y+12)=0

We get rid of parentheses

3y-6y-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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