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w in (-oo:+oo)
12*w^4+((w^2)/3)*w^2-(6*w^3) = 0
12*w^4+((w^2)/3)*w^2-6*w^3 = 0
37/3*w^4-6*w^3 = 0
w^3*(37/3*w-6) = 0
37/3*w-6 = 0 // + 6
37/3*w = 6 // : 37/3
w = 6/37/3
w = 18/37
w^3 = 0
1*w^3 = 0 // : 1
w^3 = 0
w = 0
w in { 18/37, 0 }
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