X/7=4/x+20

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Solution for X/7=4/x+20 equation: 


D( x )

x = 0

x = 0

x = 0

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

X/7 = 4/x+20 // - 4/x+20

X/7-(4/x)-20 = 0

X/7-4*x^-1-20 = 0

-4*x^-1 = -(1/7*X-20) // : -4

x^-1 = (20-(1/7*X))/(-4)

-1 < 0

1/(x^1) = (20-(1/7*X))/(-4) // * x^1

1 = x^1*((20-(1/7*X))/(-4)) // : (20-(1/7*X))/(-4)

-4*(20-1/7*X)^-1 = x^1

x = -4*(20-1/7*X)^-1

x = -4*(20-1/7*X)^-1

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