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D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
1/(2*x) = x+1/10+4/6 // - x+1/10+4/6
1/(2*x)-x-(1/10)-(4/6) = 0
1/(2*x)-x-1/10-2/3 = 0
1/2*x^-1-1*x^1-23/30*x^0 = 0
(1/2*x^0-1*x^2-23/30*x^1)/(x^1) = 0 // * x^2
x^1*(1/2*x^0-1*x^2-23/30*x^1) = 0
x^1
(-23/30)*x-x^2+1/2 = 0
(-23/30)*x-x^2+1/2 = 0
DELTA = (-23/30)^2-(-1*4*(1/2))
DELTA = 2329/900
DELTA > 0
x = ((2329/900)^(1/2)-(-23/30))/(-1*2) or x = (-(-23/30)-(2329/900)^(1/2))/(-1*2)
x = ((2329/900)^(1/2)+23/30)/(-2) or x = (23/30-(2329/900)^(1/2))/(-2)
x in { ((2329/900)^(1/2)+23/30)/(-2), (23/30-(2329/900)^(1/2))/(-2)}
x in { ((2329/900)^(1/2)+23/30)/(-2), (23/30-(2329/900)^(1/2))/(-2) }
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