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