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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x*((x+x-x+2/x-(6/1)+1)/12)+(4/2)*x-2 = 0
x*((x+x-x+2/x-6+1)/12)+(4/2)*x-2 = 0
(x*(x+2*x^-1-5))/12+2*x-2 = 0
(x*(x+2*x^-1-5))/12+(2*12*x)/12+(-2*12)/12 = 0
x*(x+2*x^-1-5)+2*12*x-2*12 = 0
x^2+19*x-24+2 = 0
x^2+19*x-22 = 0
x^2+19*x-22 = 0
x^2+19*x-22 = 0
DELTA = 19^2-(-22*1*4)
DELTA = 449
DELTA > 0
x = (449^(1/2)-19)/(1*2) or x = (-449^(1/2)-19)/(1*2)
x = (449^(1/2)-19)/2 or x = (-(449^(1/2)+19))/2
(x+(449^(1/2)+19)/2)*(x-((449^(1/2)-19)/2)) = 0
((x+(449^(1/2)+19)/2)*(x-((449^(1/2)-19)/2)))/12 = 0
((x+(449^(1/2)+19)/2)*(x-((449^(1/2)-19)/2)))/12 = 0 // * 12
(x+(449^(1/2)+19)/2)*(x-((449^(1/2)-19)/2)) = 0
( x+(449^(1/2)+19)/2 )
x+(449^(1/2)+19)/2 = 0 // - (449^(1/2)+19)/2
x = -((449^(1/2)+19)/2)
( x-((449^(1/2)-19)/2) )
x-((449^(1/2)-19)/2) = 0 // + (449^(1/2)-19)/2
x = (449^(1/2)-19)/2
x in { -((449^(1/2)+19)/2), (449^(1/2)-19)/2 }
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