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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x-(1*(5*x-(5/27))) = 0
9/x-(5*x)-(-5/27) = 0
9*x^-1-5*x^1+5/27*x^0 = 0
(5/27*x^1-5*x^2+9*x^0)/(x^1) = 0 // * x^2
x^1*(5/27*x^1-5*x^2+9*x^0) = 0
x^1
(5/27)*x-5*x^2+9 = 0
(5/27)*x-5*x^2+9 = 0
DELTA = (5/27)^2-(-5*4*9)
DELTA = 131245/729
DELTA > 0
x = ((131245/729)^(1/2)-(5/27))/(-5*2) or x = (-(5/27)-(131245/729)^(1/2))/(-5*2)
x = ((131245/729)^(1/2)-5/27)/(-10) or x = ((131245/729)^(1/2)+5/27)/10
x in { ((131245/729)^(1/2)-5/27)/(-10), ((131245/729)^(1/2)+5/27)/10}
x in { ((131245/729)^(1/2)-5/27)/(-10), ((131245/729)^(1/2)+5/27)/10 }
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