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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+1 = 12/x // - 12/x
x-(12/x)+1 = 0
x-12*x^-1+1 = 0
1*x^1-12*x^-1+1*x^0 = 0
(1*x^2+1*x^1-12*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+1*x^1-12*x^0) = 0
x^1
x^2+x-12 = 0
x^2+x-12 = 0
DELTA = 1^2-(-12*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)-1)/(1*2) or x = (-49^(1/2)-1)/(1*2)
x = 3 or x = -4
x in { -4, 3}
x in { -4, 3 }
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