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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
18/(x-3) = x/3 // - x/3
18/(x-3)-(x/3) = 0
18/(x-3)-x/3 = 0
(3*18)/(3*(x-3))+(-x*(x-3))/(3*(x-3)) = 0
3*18-x*(x-3) = 0
3*x-x^2+54 = 0
3*x-x^2+54 = 0
3*x-x^2+54 = 0
DELTA = 3^2-(-1*4*54)
DELTA = 225
DELTA > 0
x = (225^(1/2)-3)/(-1*2) or x = (-225^(1/2)-3)/(-1*2)
x = -6 or x = 9
(x+6)*(x-9) = 0
((x+6)*(x-9))/(3*(x-3)) = 0
((x+6)*(x-9))/(3*(x-3)) = 0 // * 3*(x-3)
(x+6)*(x-9) = 0
( x+6 )
x+6 = 0 // - 6
x = -6
( x-9 )
x-9 = 0 // + 9
x = 9
x in { -6, 9 }
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