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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
h+h+x-(7/x)+9 = 0
h+h+x-7*x^-1+9 = 0
1*x^1-7*x^-1+9*x^0 = 0
(1*x^2+9*x^1-7*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+9*x^1-7*x^0) = 0
x^1
x^2+9*x-7 = 0
x^2+9*x-7 = 0
DELTA = 9^2-(-7*1*4)
DELTA = 109
DELTA > 0
x = (109^(1/2)-9)/(1*2) or x = (-109^(1/2)-9)/(1*2)
x = (109^(1/2)-9)/2 or x = (-(109^(1/2)+9))/2
x in { (-(109^(1/2)+9))/2, (109^(1/2)-9)/2}
x in { (-(109^(1/2)+9))/2, (109^(1/2)-9)/2 }
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