21/q=3

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Solution for 21/q=3 equation: 



21/q=3

We move all terms to the left:

21/q-(3)=0



Domain of the equation: q!=0

q∈R



We multiply all the terms by the denominator


-3*q+21=0

We add all the numbers together, and all the variables

-3q+21=0

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

-3q=-21

q=-21/-3

q=+7

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