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D( x )
(1/2)*x = 0
(1/2)*x = 0
(1/2)*x = 0
1/2*x = 0 // : 1/2
x = 0
x in (-oo:0) U (0:+oo)
x = 50/((1/2)*x) // - 50/((1/2)*x)
x-(50/((1/2)*x)) = 0
x-100*x^-1 = 0
1*x^1-100*x^-1 = 0
(1*x^2-100*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-100*x^0) = 0
x^1
x^2-100 = 0
x^2-100 = 0
DELTA = 0^2-(-100*1*4)
DELTA = 400
DELTA > 0
x = (400^(1/2)+0)/(1*2) or x = (0-400^(1/2))/(1*2)
x = 10 or x = -10
x in { -10, 10}
x in { -10, 10 }
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