9=89-4y

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Solution for 9=89-4y equation: 



9=89-4y

We move all terms to the left:

9-(89-4y)=0

We add all the numbers together, and all the variables

-(-4y+89)+9=0

We get rid of parentheses

4y-89+9=0

We add all the numbers together, and all the variables

4y-80=0

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

4y=80

y=80/4

y=20

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