4/x+28

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Solution for 4/x+28 equation: 


D( x )

x = 0

x = 0

x = 0

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

4/x+28 = 0

4*x^-1 = -28 // : 4

x^-1 = -7

-1 < 0

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

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

-1/7 = x^1

x = -1/7

x = -1/7

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