21/x=8-1

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Solution for 21/x=8-1 equation: 



21/x=8-1

We move all terms to the left:

21/x-(8-1)=0



Domain of the equation: x!=0

x∈R



We add all the numbers together, and all the variables

21/x-7=0

We multiply all the terms by the denominator


-7*x+21=0

We add all the numbers together, and all the variables

-7x+21=0

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

-7x=-21

x=-21/-7

x=+3

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