15+6y=21+3y

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Solution for 15+6y=21+3y equation: 



15+6y=21+3y

We move all terms to the left:

15+6y-(21+3y)=0

We add all the numbers together, and all the variables

6y-(3y+21)+15=0

We get rid of parentheses

6y-3y-21+15=0

We add all the numbers together, and all the variables

3y-6=0

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

3y=6

y=6/3

y=2

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