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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(12/x)-4 = 3/5 // - 3/5
x-(12/x)-(3/5)-4 = 0
x-12*x^-1-3/5-4 = 0
1*x^1-12*x^-1-23/5*x^0 = 0
(1*x^2-23/5*x^1-12*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-23/5*x^1-12*x^0) = 0
x^1
x^2+(-23/5)*x-12 = 0
x^2+(-23/5)*x-12 = 0
DELTA = (-23/5)^2-(-12*1*4)
DELTA = 1729/25
DELTA > 0
x = ((1729/25)^(1/2)-(-23/5))/(1*2) or x = (-(-23/5)-(1729/25)^(1/2))/(1*2)
x = ((1729/25)^(1/2)+23/5)/2 or x = (23/5-(1729/25)^(1/2))/2
x in { (23/5-(1729/25)^(1/2))/2, ((1729/25)^(1/2)+23/5)/2}
x in { (23/5-(1729/25)^(1/2))/2, ((1729/25)^(1/2)+23/5)/2 }
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