15=4y-15-7y

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Solution for 15=4y-15-7y equation: 



15=4y-15-7y

We move all terms to the left:

15-(4y-15-7y)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3y+15+15=0

We add all the numbers together, and all the variables

3y+30=0

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

3y=-30

y=-30/3

y=-10

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