5/4=15/x

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Solution for 5/4=15/x equation: 


D( x )

x = 0

x = 0

x = 0

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

5/4 = 15/x // - 15/x

5/4-(15/x) = 0

5/4-15*x^-1 = 0

-15*x^-1 = -5/4 // : -15

x^-1 = 1/12

-1 < 0

1/(x^1) = 1/12 // * x^1

1 = 1/12*x^1 // : 1/12

12 = x^1

x = 12

x = 12

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