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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x-(4*x) = -13 // + 13
12/x-(4*x)+13 = 0
12/x-4*x+13 = 0
12*x^-1-4*x^1+13*x^0 = 0
(13*x^1-4*x^2+12*x^0)/(x^1) = 0 // * x^2
x^1*(13*x^1-4*x^2+12*x^0) = 0
x^1
13*x-4*x^2+12 = 0
13*x-4*x^2+12 = 0
DELTA = 13^2-(-4*4*12)
DELTA = 361
DELTA > 0
x = (361^(1/2)-13)/(-4*2) or x = (-361^(1/2)-13)/(-4*2)
x = -3/4 or x = 4
x in { -3/4, 4}
x in { -3/4, 4 }
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