20/12=15/x

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Solution for 20/12=15/x equation: 


D( x )

x = 0

x = 0

x = 0

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

20/12 = 15/x // - 15/x

20/12-(15/x) = 0

20/12-15*x^-1 = 0

-15*x^-1 = -5/3 // : -15

x^-1 = 1/9

-1 < 0

1/(x^1) = 1/9 // * x^1

1 = 1/9*x^1 // : 1/9

9 = x^1

x = 9

x = 9

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