-y-17=-21

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Solution for -y-17=-21 equation: 



-y-17=-21

We move all terms to the left:

-y-17-(-21)=0

We add all the numbers together, and all the variables

-1y+4=0

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

-y=-4

y=-4/-1

y=+4

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