4=--7/x+1

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Solution for 4=--7/x+1 equation: 


D( x )

x = 0

x = 0

x = 0

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

4 = 1-(-7/x) // - 1-(-7/x)

4-7/x-1 = 0

-7*x^-1 = -3 // : -7

x^-1 = 3/7

-1 < 0

1/(x^1) = 3/7 // * x^1

1 = 3/7*x^1 // : 3/7

7/3 = x^1

x = 7/3

x = 7/3

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