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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(12/x)-8 = 0
x-12*x^-1-8 = 0
1*x^1-12*x^-1-8*x^0 = 0
(1*x^2-8*x^1-12*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-8*x^1-12*x^0) = 0
x^1
x^2-8*x-12 = 0
x^2-8*x-12 = 0
DELTA = (-8)^2-(-12*1*4)
DELTA = 112
DELTA > 0
x = (112^(1/2)+8)/(1*2) or x = (8-112^(1/2))/(1*2)
x = (4*7^(1/2)+8)/2 or x = (8-4*7^(1/2))/2
x in { (8-4*7^(1/2))/2, (4*7^(1/2)+8)/2}
x in { (8-4*7^(1/2))/2, (4*7^(1/2)+8)/2 }
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