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w in (-oo:+oo)
w/(-0.4) > 3/0.8 // - 3/0.8
w/(-0.4)-(3/0.8) > 0
w/(-0.4)-3.75 > 0
-2.5*w-3.75 > 0 // + 3.75
-2.5*w > 3.75 // : -2.5
w < 3.75/(-2.5)
w < -1.5
w in (-oo:-1.5)
(-oo:-1.5)
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