15/4=30/x

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Solution for 15/4=30/x equation: 


D( x )

x = 0

x = 0

x = 0

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

15/4 = 30/x // - 30/x

15/4-(30/x) = 0

15/4-30*x^-1 = 0

-30*x^-1 = -15/4 // : -30

x^-1 = 1/8

-1 < 0

1/(x^1) = 1/8 // * x^1

1 = 1/8*x^1 // : 1/8

8 = x^1

x = 8

x = 8

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