21+7y=-28

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Solution for 21+7y=-28 equation: 



21+7y=-28

We move all terms to the left:

21+7y-(-28)=0

We add all the numbers together, and all the variables

7y+49=0

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

7y=-49

y=-49/7

y=-7

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