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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-2 = x+15/6 // - x+15/6
10/x-x-(15/6)-2 = 0
10/x-x-5/2-2 = 0
10*x^-1-1*x^1-9/2*x^0 = 0
(10*x^0-1*x^2-9/2*x^1)/(x^1) = 0 // * x^2
x^1*(10*x^0-1*x^2-9/2*x^1) = 0
x^1
(-9/2)*x-x^2+10 = 0
(-9/2)*x-x^2+10 = 0
DELTA = (-9/2)^2-(-1*4*10)
DELTA = 241/4
DELTA > 0
x = ((241/4)^(1/2)-(-9/2))/(-1*2) or x = (-(-9/2)-(241/4)^(1/2))/(-1*2)
x = ((241/4)^(1/2)+9/2)/(-2) or x = (9/2-(241/4)^(1/2))/(-2)
x in { ((241/4)^(1/2)+9/2)/(-2), (9/2-(241/4)^(1/2))/(-2)}
x in { ((241/4)^(1/2)+9/2)/(-2), (9/2-(241/4)^(1/2))/(-2) }
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