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w in (-oo:+oo)
w/(-3) = -3.99 // + 3.99
w/(-3)+3.99 = 0
3.99-1/3*w = 0 // - 3.99
-1/3*w = -3.99 // : -1/3
w = -3.99/(-1/3)
w = 11.97000012
w = 11.97000012
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