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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)
(6*x)/(x-3)+x/2 = 0
(2*6*x)/(2*(x-3))+(x*(x-3))/(2*(x-3)) = 0
x*(x-3)+2*6*x = 0
x^2+9*x = 0
x^2+9*x = 0
x*(x+9) = 0
x+9 = 0 // - 9
x = -9
x*(x+9) = 0
(x*(x+9))/(2*(x-3)) = 0
(x*(x+9))/(2*(x-3)) = 0 // * 2*(x-3)
x*(x+9) = 0
( x+9 )
x+9 = 0 // - 9
x = -9
( x )
x = 0
x in { -9, 0 }
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