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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x-6)/x = (x-3)/3 // - (x-3)/3
(2*x-6)/x-((x-3)/3) = 0
(2*x-6)/x+(-1*(x-3))/3 = 0
(3*(2*x-6))/(3*x)+(-1*x*(x-3))/(3*x) = 0
3*(2*x-6)-1*x*(x-3) = 0
9*x-x^2-18 = 0
9*x-x^2-18 = 0
9*x-x^2-18 = 0
DELTA = 9^2-(-18*(-1)*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)-9)/(-1*2) or x = (-9^(1/2)-9)/(-1*2)
x = 3 or x = 6
(x-3)*(x-6) = 0
((x-3)*(x-6))/(3*x) = 0
((x-3)*(x-6))/(3*x) = 0 // * 3*x
(x-3)*(x-6) = 0
( x-3 )
x-3 = 0 // + 3
x = 3
( x-6 )
x-6 = 0 // + 6
x = 6
x in { 3, 6 }
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