-7y=21-21

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Solution for -7y=21-21 equation: 



-7y=21-21

We move all terms to the left:

-7y-(21-21)=0

We add all the numbers together, and all the variables

-7y-0=0

We add all the numbers together, and all the variables

-7y=0

y=0/-7

y=0

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