21-4y=1

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Solution for 21-4y=1 equation: 



21-4y=1

We move all terms to the left:

21-4y-(1)=0

We add all the numbers together, and all the variables

-4y+20=0

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

-4y=-20

y=-20/-4

y=+5

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