4/7+4d=r/x

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Solution for 4/7+4d=r/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4*d+4/7 = r/x // - r/x

4*d-(r/x)+4/7 = 0

-r*x^-1 = -(4*d+4/7) // : -r

x^-1 = (4*d+4/7)/r

-1 < 0

1/(x^1) = (4*d+4/7)/r // * x^1

1 = x^1*((4*d+4/7)/r) // : (4*d+4/7)/r

1/((4*d+4/7)/r) = x^1

x = 1/((4*d+4/7)/r)

x = 1/((4*d+4/7)/r)

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