30/12=10/x

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Solution for 30/12=10/x equation: 


D( x )

x = 0

x = 0

x = 0

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

30/12 = 10/x // - 10/x

30/12-(10/x) = 0

30/12-10*x^-1 = 0

-10*x^-1 = -5/2 // : -10

x^-1 = 1/4

-1 < 0

1/(x^1) = 1/4 // * x^1

1 = 1/4*x^1 // : 1/4

4 = x^1

x = 4

x = 4

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