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w in (-oo:+oo)
20 = (1/5)*w // - (1/5)*w
20-((1/5)*w) = 0
(-1/5)*w+20 = 0
20-1/5*w = 0 // - 20
-1/5*w = -20 // : -1/5
w = -20/(-1/5)
w = 100
w = 100
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