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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+20 = 2/x+7 // - 2/x+7
x-(2/x)-7+20 = 0
x-2*x^-1-7+20 = 0
1*x^1-2*x^-1+13*x^0 = 0
(1*x^2+13*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+13*x^1-2*x^0) = 0
x^1
x^2+13*x-2 = 0
x^2+13*x-2 = 0
DELTA = 13^2-(-2*1*4)
DELTA = 177
DELTA > 0
x = (177^(1/2)-13)/(1*2) or x = (-177^(1/2)-13)/(1*2)
x = (177^(1/2)-13)/2 or x = (-(177^(1/2)+13))/2
x in { (-(177^(1/2)+13))/2, (177^(1/2)-13)/2}
x in { (-(177^(1/2)+13))/2, (177^(1/2)-13)/2 }
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