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w in (-oo:+oo)
5 = w/12.5 // - w/12.5
5-(w/12.5) = 0
5-0.08*w = 0
5-0.08*w = 0 // - 5
-0.08*w = -5 // : -0.08
w = -5/(-0.08)
w = 62.5
w = 62.5
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