7=84/x

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Solution for 7=84/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7 = 84/x // - 84/x

7-(84/x) = 0

7-84*x^-1 = 0

-84*x^-1 = -7 // : -84

x^-1 = 1/12

-1 < 0

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

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

12 = x^1

x = 12

x = 12

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