20/5=(15-x)/x

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Solution for 20/5=(15-x)/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

20/5 = (15-x)/x // - (15-x)/x

20/5-((15-x)/x) = 0

(-1*(15-x))/x+4 = 0

(-1*(15-x))/x+(4*x)/x = 0

4*x-1*(15-x) = 0

5*x-15 = 0

(5*x-15)/x = 0

(5*x-15)/x = 0 // * x

5*x-15 = 0

5*x-15 = 0 // + 15

5*x = 15 // : 5

x = 15/5

x = 3

x = 3

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