3=(x)/(20-x)

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Solution for 3=(x)/(20-x) equation: 


D( x )

20-x = 0

20-x = 0

20-x = 0

20-x = 0 // - 20

-x = -20 // * -1

x = 20

x in (-oo:20) U (20:+oo)

3 = x/(20-x) // - x/(20-x)

3-(x/(20-x)) = 0

(-1*x)/(20-x)+3 = 0

(-1*x)/(20-x)+(3*(20-x))/(20-x) = 0

3*(20-x)-1*x = 0

60-4*x = 0

(60-4*x)/(20-x) = 0

(60-4*x)/(20-x) = 0 // * 20-x

60-4*x = 0

60-4*x = 0 // - 60

-4*x = -60 // : -4

x = -60/(-4)

x = 15

x = 15

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