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w in (-oo:+oo)
6*w^2-(((9*w)/3)*w^2)-(18*w) = 0
6*w^2-3*w^3-18*w = 0
6*w^2-3*w^3-18*w = 0
3*w*(2*w-w^2-6) = 0
2*w-w^2-6 = 0
DELTA = 2^2-(-6*(-1)*4)
DELTA = -20
DELTA < 0
3*w = 0
3*w = 0 // : 3
w = 0
w = 0
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