7/x+x=20

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Solution for 7/x+x=20 equation: 


D( x )

x = 0

x = 0

x = 0

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

x+7/x = 20 // - 20

x+7/x-20 = 0

1*x^1+7*x^-1-20*x^0 = 0

(1*x^2-20*x^1+7*x^0)/(x^1) = 0 // * x^2

x^1*(1*x^2-20*x^1+7*x^0) = 0

x^1

x^2-20*x+7 = 0

x^2-20*x+7 = 0

DELTA = (-20)^2-(1*4*7)

DELTA = 372

DELTA > 0

x = (372^(1/2)+20)/(1*2) or x = (20-372^(1/2))/(1*2)

x = (2*93^(1/2)+20)/2 or x = (20-2*93^(1/2))/2

x in { (20-2*93^(1/2))/2, (2*93^(1/2)+20)/2} 

x in { (20-2*93^(1/2))/2, (2*93^(1/2)+20)/2 }

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