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w in (-oo:+oo)
12.5 = w/5 // - w/5
12.5-(w/5) = 0
12.5-1/5*w = 0 // - 12.5
-1/5*w = -12.5 // : -1/5
w = -12.5/(-1/5)
w = 62.5
w = 62.5
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