4y+21=-2y+9

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Solution for 4y+21=-2y+9 equation: 



4y+21=-2y+9

We move all terms to the left:

4y+21-(-2y+9)=0

We get rid of parentheses

4y+2y-9+21=0

We add all the numbers together, and all the variables

6y+12=0

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

6y=-12

y=-12/6

y=-2

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