7-4y=-21

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Solution for 7-4y=-21 equation: 



7-4y=-21

We move all terms to the left:

7-4y-(-21)=0

We add all the numbers together, and all the variables

-4y+28=0

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

-4y=-28

y=-28/-4

y=+7

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