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D( w )
w+5 = 0
w+5 = 0
w+5 = 0
w+5 = 0 // - 5
w = -5
w in (-oo:-5) U (-5:+oo)
(w+2)/(w+5)-2 = 0
(w+2)/(w+5)+(-2*(w+5))/(w+5) = 0
w-2*(w+5)+2 = 0
-w-8 = 0
(-w-8)/(w+5) = 0
(-w-8)/(w+5) = 0 // * w+5
-w-8 = 0
-w-8 = 0 // + 8
-w = 8 // * -1
w = -8
w = -8
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