3y-7y-7=21

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Solution for 3y-7y-7=21 equation: 



3y-7y-7=21

We move all terms to the left:

3y-7y-7-(21)=0

We add all the numbers together, and all the variables

-4y-28=0

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

-4y=28

y=28/-4

y=-7

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