4/5=12/x

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Solution for 4/5=12/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4/5 = 12/x // - 12/x

4/5-(12/x) = 0

4/5-12*x^-1 = 0

-12*x^-1 = -4/5 // : -12

x^-1 = 1/15

-1 < 0

1/(x^1) = 1/15 // * x^1

1 = 1/15*x^1 // : 1/15

15 = x^1

x = 15

x = 15

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