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D( x )
5*x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
3*x+14/(5*x) = 7 // - 7
3*x+14/(5*x)-7 = 0
3*x^1+14/5*x^-1-7*x^0 = 0
(3*x^2-7*x^1+14/5*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2-7*x^1+14/5*x^0) = 0
x^1
3*x^2-7*x+14/5 = 0
3*x^2-7*x+14/5 = 0
DELTA = (-7)^2-(3*4*(14/5))
DELTA = 77/5
DELTA > 0
x = ((77/5)^(1/2)+7)/(2*3) or x = (7-(77/5)^(1/2))/(2*3)
x = ((77/5)^(1/2)+7)/6 or x = (7-(77/5)^(1/2))/6
x in { (7-(77/5)^(1/2))/6, ((77/5)^(1/2)+7)/6}
x in { (7-(77/5)^(1/2))/6, ((77/5)^(1/2)+7)/6 }
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