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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