12/40=30/x

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Solution for 12/40=30/x equation: 


D( x )

x = 0

x = 0

x = 0

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

12/40 = 30/x // - 30/x

12/40-(30/x) = 0

12/40-30*x^-1 = 0

-30*x^-1 = -3/10 // : -30

x^-1 = 1/100

-1 < 0

1/(x^1) = 1/100 // * x^1

1 = 1/100*x^1 // : 1/100

100 = x^1

x = 100

x = 100

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