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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12*x-(17/x)-1 = 10*x-(10/x)-1 // - 10*x-(10/x)-1
12*x-(10*x)-(17/x)+10/x-1+1 = 0
12*x-10*x-17*x^-1+10/x-1+1 = 0
2*x^1-7*x^-1 = 0
(2*x^2-7*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-7*x^0) = 0
x^1
2*x^2-7 = 0
2*x^2-7 = 0
DELTA = 0^2-(-7*2*4)
DELTA = 56
DELTA > 0
x = (56^(1/2)+0)/(2*2) or x = (0-56^(1/2))/(2*2)
x = (1*14^(1/2))/2 or x = (-14^(1/2))/2
x in { (-14^(1/2))/2, (1*14^(1/2))/2}
x in { (-14^(1/2))/2, (1*14^(1/2))/2 }
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