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w in (-oo:+oo)
w/(-20) = -2.5 // + 2.5
w/(-20)+2.5 = 0
2.5-1/20*w = 0 // - 2.5
-1/20*w = -2.5 // : -1/20
w = -2.5/(-1/20)
w = 50
w = 50
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