3=21/x+5

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Solution for 3=21/x+5 equation: 



3=21/x+5

We move all terms to the left:

3-(21/x+5)=0



Domain of the equation: x+5)!=0

x∈R



We get rid of parentheses

-21/x-5+3=0

We multiply all the terms by the denominator


-5*x+3*x-21=0

We add all the numbers together, and all the variables

-2x-21=0

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

-2x=21

x=21/-2

x=-10+1/2

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