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D( w )
w+3 = 0
w+7 = 0
w+3 = 0
w+3 = 0
w+3 = 0 // - 3
w = -3
w+7 = 0
w+7 = 0
w+7 = 0 // - 7
w = -7
w in (-oo:-7) U (-7:-3) U (-3:+oo)
(w+7)/(w+3) = (w+1)/(w+7)+1 // - (w+1)/(w+7)+1
(w+7)/(w+3)-((w+1)/(w+7))-1 = 0
(w+7)/(w+3)+(-1*(w+1))/(w+7)-1 = 0
((w+7)^2)/((w+3)*(w+7))+(-1*(w+1)*(w+3))/((w+3)*(w+7))+(-1*(w+3)*(w+7))/((w+3)*(w+7)) = 0
(w+7)^2-1*(w+1)*(w+3)-1*(w+3)*(w+7) = 0
10*w-w^2-10*w-21+46 = 0
25-w^2 = 0
(25-w^2)/((w+3)*(w+7)) = 0
(25-w^2)/((w+3)*(w+7)) = 0 // * (w+3)*(w+7)
25-w^2 = 0
-1*w^2 = -25 // : -1
w^2 = 25
w^2 = 25 // ^ 1/2
abs(w) = 5
w = 5 or w = -5
w in { 5, -5 }
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