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w in (-oo:+oo)
9*w^4+w*((18*w^2)/3) = 0
9*w^4+6*w^3 = 0
3*w^3*(3*w+2) = 0
3*w+2 = 0 // - 2
3*w = -2 // : 3
w = -2/3
3*w^3 = 0
3*w^3 = 0 // : 3
w^3 = 0
w = 0
w in { -2/3, 0 }
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