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D( w )
6*w = 0
6*w = 0
6*w = 0
6*w = 0 // : 6
w = 0
w in (-oo:0) U (0:+oo)
(w-2)/(6*w)-((2*w-2)/(6*w))-((w+10)/(6*w)) = 0
(w-2)/(6*w)+(-1*(2*w-2))/(6*w)+(-1*(w+10))/(6*w) = 0
w-1*(2*w-2)-1*(w+10)-2 = 0
-w-w-10 = 0
-2*w-10 = 0
(-2*w-10)/(6*w) = 0
(-2*w-10)/(6*w) = 0 // * 6*w
-2*w-10 = 0
-2*w-10 = 0 // + 10
-2*w = 10 // : -2
w = 10/(-2)
w = -5
w = -5
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