21-7=2y

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Solution for 21-7=2y equation: 



21-7=2y

We move all terms to the left:

21-7-(2y)=0

We add all the numbers together, and all the variables

-2y+14=0

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

-2y=-14

y=-14/-2

y=+7

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