21+9+4y=66

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Solution for 21+9+4y=66 equation: 



21+9+4y=66

We move all terms to the left:

21+9+4y-(66)=0

We add all the numbers together, and all the variables

4y-36=0

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

4y=36

y=36/4

y=9

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