(7/x)+(5/x)=4

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Solution for (7/x)+(5/x)=4 equation: 


D( x )

x = 0

x = 0

x = 0

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

7/x+5/x = 4 // - 4

7/x+5/x-4 = 0

12*x^-1 = 4 // : 12

x^-1 = 1/3

-1 < 0

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

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

3 = x^1

x = 3

x = 3

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