21/a=7

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Solution for 21/a=7 equation: 



21/a=7

We move all terms to the left:

21/a-(7)=0



Domain of the equation: a!=0

a∈R



We multiply all the terms by the denominator


-7*a+21=0

We add all the numbers together, and all the variables

-7a+21=0

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

-7a=-21

a=-21/-7

a=+3

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