7y+21=3-2y

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Solution for 7y+21=3-2y equation: 



7y+21=3-2y

We move all terms to the left:

7y+21-(3-2y)=0

We add all the numbers together, and all the variables

7y-(-2y+3)+21=0

We get rid of parentheses

7y+2y-3+21=0

We add all the numbers together, and all the variables

9y+18=0

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

9y=-18

y=-18/9

y=-2

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