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w in (-oo:+oo)
18 = w/0.2 // - w/0.2
18-(w/0.2) = 0
18-5*w = 0
18-5*w = 0 // - 18
-5*w = -18 // : -5
w = -18/(-5)
w = 18/5
w = 18/5
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