21-2y=17

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Solution for 21-2y=17 equation: 



21-2y=17

We move all terms to the left:

21-2y-(17)=0

We add all the numbers together, and all the variables

-2y+4=0

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

-2y=-4

y=-4/-2

y=+2

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