9/15=12/x

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Solution for 9/15=12/x equation: 


D( x )

x = 0

x = 0

x = 0

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

9/15 = 12/x // - 12/x

9/15-(12/x) = 0

9/15-12*x^-1 = 0

-12*x^-1 = -3/5 // : -12

x^-1 = 1/20

-1 < 0

1/(x^1) = 1/20 // * x^1

1 = 1/20*x^1 // : 1/20

20 = x^1

x = 20

x = 20

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