21/y=7

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Solution for 21/y=7 equation: 



21/y=7

We move all terms to the left:

21/y-(7)=0



Domain of the equation: y!=0

y∈R



We multiply all the terms by the denominator


-7*y+21=0

We add all the numbers together, and all the variables

-7y+21=0

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

-7y=-21

y=-21/-7

y=+3

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