21=5y+15-7y

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Solution for 21=5y+15-7y equation: 



21=5y+15-7y

We move all terms to the left:

21-(5y+15-7y)=0

We add all the numbers together, and all the variables

-(-2y+15)+21=0

We get rid of parentheses

2y-15+21=0

We add all the numbers together, and all the variables

2y+6=0

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

2y=-6

y=-6/2

y=-3

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