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w in (-oo:+oo)
72*w^5+w^2*((32*w^3)/(-8))-(56*w^4) = 0
72*w^5+w^2*((32*w^3)/(-8))-56*w^4 = 0
68*w^5-56*w^4 = 0
4*w^4*(17*w-14) = 0
17*w-14 = 0 // + 14
17*w = 14 // : 17
w = 14/17
4*w^4 = 0
4*w^4 = 0 // : 4
w^4 = 0
w = 0
w in { 14/17, 0 }
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