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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x = 1/x-1+7 // - 1/x-1+7
4*x-(1/x)-7+1 = 0
4*x-x^-1-7+1 = 0
4*x^1-1*x^-1-6*x^0 = 0
(4*x^2-6*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-6*x^1-1*x^0) = 0
x^1
4*x^2-6*x-1 = 0
4*x^2-6*x-1 = 0
DELTA = (-6)^2-(-1*4*4)
DELTA = 52
DELTA > 0
x = (52^(1/2)+6)/(2*4) or x = (6-52^(1/2))/(2*4)
x = (2*13^(1/2)+6)/8 or x = (6-2*13^(1/2))/8
x in { (6-2*13^(1/2))/8, (2*13^(1/2)+6)/8}
x in { (6-2*13^(1/2))/8, (2*13^(1/2)+6)/8 }
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