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w in (-oo:+oo)
6*w^2-(((21*w)/3)*w^2)-(9*w) = 0
6*w^2-7*w^3-9*w = 0
6*w^2-7*w^3-9*w = 0
w*(6*w-7*w^2-9) = 0
6*w-7*w^2-9 = 0
DELTA = 6^2-(-9*(-7)*4)
DELTA = -216
DELTA < 0
w = 0
w = 0
w = 0
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