60/40=30/x

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Solution for 60/40=30/x equation: 


D( x )

x = 0

x = 0

x = 0

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

60/40 = 30/x // - 30/x

60/40-(30/x) = 0

60/40-30*x^-1 = 0

-30*x^-1 = -3/2 // : -30

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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