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D( w )
w+3 = 0
w+3 = 0
w+3 = 0
w+3 = 0 // - 3
w = -3
w in (-oo:-3) U (-3:+oo)
9/22 = (5*w+1)/(w+3) // - (5*w+1)/(w+3)
9/22-((5*w+1)/(w+3)) = 0
(-1*(5*w+1))/(w+3)+9/22 = 0
(-1*22*(5*w+1))/(22*(w+3))+(9*(w+3))/(22*(w+3)) = 0
9*(w+3)-1*22*(5*w+1) = 0
5-101*w = 0
(5-101*w)/(22*(w+3)) = 0
(5-101*w)/(22*(w+3)) = 0 // * 22*(w+3)
5-101*w = 0
5-101*w = 0 // - 5
-101*w = -5 // : -101
w = -5/(-101)
w = 5/101
w = 5/101
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