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w in (-oo:+oo)
4-(((9*w)/4)*w^2)-49 = 0
(-9/4)*w^3-49+4 = 0
-9/4*w^3 = 45 // : -9/4
w^3 = -20
w^3 = -20 // ^ 1/3
w = -20^(1/3)
w = -20^(1/3)
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