4-5/x=7/x

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Solution for 4-5/x=7/x equation: 


D( x )

x = 0

x = 0

x = 0

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

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

4-(5/x)-(7/x) = 0

4-5*x^-1-7*x^-1 = 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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