X/7=28/x

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Solution for X/7=28/x equation: 


D( x )

x = 0

x = 0

x = 0

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

X/7 = 28/x // - 28/x

X/7-(28/x) = 0

X/7-28*x^-1 = 0

-28*x^-1 = -(1/7*X) // : -28

x^-1 = 1/196*X

-1 < 0

1/(x^1) = 1/196*X // * x^1

1 = 1/196*X*x^1 // : 1/196*X

196*X^-1 = x^1

x = 196*X^-1

x = 196*X^-1

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