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w in (-oo:+oo)
30*w^3-(((6*w)/6)*w) = 0
30*w^3-w^2 = 0
30*w^3-w^2 = 0
w^2*(30*w-1) = 0
30*w-1 = 0 // + 1
30*w = 1 // : 30
w = 1/30
w^2 = 0
1*w^2 = 0 // : 1
w^2 = 0
w = 0
w in { 1/30, 0 }
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