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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 7-(2*x) // - 7-(2*x)
2*x+6/x-7 = 0
2*x^1+6*x^-1-7*x^0 = 0
(2*x^2-7*x^1+6*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-7*x^1+6*x^0) = 0
x^1
2*x^2-7*x+6 = 0
2*x^2-7*x+6 = 0
DELTA = (-7)^2-(2*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)+7)/(2*2) or x = (7-1^(1/2))/(2*2)
x = 2 or x = 3/2
x in { 3/2, 2}
x in { 3/2, 2 }
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