40/1=12/x

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Solution for 40/1=12/x equation: 


D( x )

x = 0

x = 0

x = 0

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

40/1 = 12/x // - 12/x

40/1-(12/x) = 0

40-12*x^-1 = 0

-12*x^-1 = -40 // : -12

x^-1 = 10/3

-1 < 0

1/(x^1) = 10/3 // * x^1

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

3/10 = x^1

x = 3/10

x = 3/10

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