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w in (-oo:+oo)
-4 = (2/5)*w // - (2/5)*w
-((2/5)*w)-4 = 0
(-2/5)*w-4 = 0
-2/5*w-4 = 0 // + 4
-2/5*w = 4 // : -2/5
w = 4/(-2/5)
w = -10
w = -10
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