7-12/x

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Solution for 7-12/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7-(12/x) = 0

7-12*x^-1 = 0

-12*x^-1 = -7 // : -12

x^-1 = 7/12

-1 < 0

1/(x^1) = 7/12 // * x^1

1 = 7/12*x^1 // : 7/12

12/7 = x^1

x = 12/7

x = 12/7

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