21=4y+7

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Solution for 21=4y+7 equation: 



21=4y+7

We move all terms to the left:

21-(4y+7)=0

We get rid of parentheses

-4y-7+21=0

We add all the numbers together, and all the variables

-4y+14=0

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

-4y=-14

y=-14/-4

y=3+1/2

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