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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-(2/x)-2 = 6/x-2+7 // - 6/x-2+7
3*x-(2/x)-(6/x)-7-2+2 = 0
3*x-2*x^-1-6*x^-1-7-2+2 = 0
3*x^1-8*x^-1-7*x^0 = 0
(3*x^2-7*x^1-8*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2-7*x^1-8*x^0) = 0
x^1
3*x^2-7*x-8 = 0
3*x^2-7*x-8 = 0
DELTA = (-7)^2-(-8*3*4)
DELTA = 145
DELTA > 0
x = (145^(1/2)+7)/(2*3) or x = (7-145^(1/2))/(2*3)
x = (145^(1/2)+7)/6 or x = (7-145^(1/2))/6
x in { (7-145^(1/2))/6, (145^(1/2)+7)/6}
x in { (7-145^(1/2))/6, (145^(1/2)+7)/6 }
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