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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-(54/x) = -9 // + 9
3*x-(54/x)+9 = 0
3*x-54*x^-1+9 = 0
3*x^1-54*x^-1+9*x^0 = 0
(3*x^2+9*x^1-54*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2+9*x^1-54*x^0) = 0
x^1
3*x^2+9*x-54 = 0
3*x^2+9*x-54 = 0
DELTA = 9^2-(-54*3*4)
DELTA = 729
DELTA > 0
x = (729^(1/2)-9)/(2*3) or x = (-729^(1/2)-9)/(2*3)
x = 3 or x = -6
x in { -6, 3}
x in { -6, 3 }
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