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w in (-oo:+oo)
-2.8 = w/(-3) // - w/(-3)
-(w/(-3))-2.8 = 0
1/3*w-2.8 = 0 // + 2.8
1/3*w = 2.8 // : 1/3
w = 2.8/1/3
w = 8.40000008
w = 8.40000008
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