4y+21=7y-27

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Solution for 4y+21=7y-27 equation: 



4y+21=7y-27

We move all terms to the left:

4y+21-(7y-27)=0

We get rid of parentheses

4y-7y+27+21=0

We add all the numbers together, and all the variables

-3y+48=0

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

-3y=-48

y=-48/-3

y=+16

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