4y-21=78+y

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Solution for 4y-21=78+y equation: 



4y-21=78+y

We move all terms to the left:

4y-21-(78+y)=0

We add all the numbers together, and all the variables

4y-(y+78)-21=0

We get rid of parentheses

4y-y-78-21=0

We add all the numbers together, and all the variables

3y-99=0

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

3y=99

y=99/3

y=33

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