8=21-4y

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Solution for 8=21-4y equation: 



8=21-4y

We move all terms to the left:

8-(21-4y)=0

We add all the numbers together, and all the variables

-(-4y+21)+8=0

We get rid of parentheses

4y-21+8=0

We add all the numbers together, and all the variables

4y-13=0

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

4y=13

y=13/4

y=3+1/4

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