21=-3+4y

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Solution for 21=-3+4y equation: 



21=-3+4y

We move all terms to the left:

21-(-3+4y)=0

We add all the numbers together, and all the variables

-(4y-3)+21=0

We get rid of parentheses

-4y+3+21=0

We add all the numbers together, and all the variables

-4y+24=0

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

-4y=-24

y=-24/-4

y=+6

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