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D( w )
3*w+9 = 0
2*w+6 = 0
3*w+9 = 0
3*w+9 = 0
3*w+9 = 0 // - 9
3*w = -9 // : 3
w = -9/3
w = -3
2*w+6 = 0
2*w+6 = 0
2*w+6 = 0 // - 6
2*w = -6 // : 2
w = -6/2
w = -3
w in (-oo:-3) U (-3:+oo)
6/(3*w+9)+4/(2*w+6) = 0
(6*(2*w+6))/((3*w+9)*(2*w+6))+(4*(3*w+9))/((3*w+9)*(2*w+6)) = 0
6*(2*w+6)+4*(3*w+9) = 0
24*w+72 = 0
(24*w+72)/((3*w+9)*(2*w+6)) = 0
(24*w+72)/((3*w+9)*(2*w+6)) = 0 // * (3*w+9)*(2*w+6)
24*w+72 = 0
24*w+72 = 0 // - 72
24*w = -72 // : 24
w = -72/24
w = -3
w in { -3}
w belongs to the empty set
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