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w in (-oo:+oo)
10 = (4/5)*w+5 // - (4/5)*w+5
10-((4/5)*w)-5 = 0
(-4/5)*w-5+10 = 0
5-4/5*w = 0 // - 5
-4/5*w = -5 // : -4/5
w = -5/(-4/5)
w = 25/4
w = 25/4
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