15=78-99y

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Solution for 15=78-99y equation: 



15=78-99y

We move all terms to the left:

15-(78-99y)=0

We add all the numbers together, and all the variables

-(-99y+78)+15=0

We get rid of parentheses

99y-78+15=0

We add all the numbers together, and all the variables

99y-63=0

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

99y=63

y=63/99

y=7/11

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