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w in (-oo:+oo)
(5*w)/10-(4/10) = 4/5 // - 4/5
(5*w)/10-(4/10)-(4/5) = 0
(5*w)/10-2/5-4/5 = 0
1/2*w-6/5 = 0 // + 6/5
1/2*w = 6/5 // : 1/2
w = 6/5/1/2
w = 12/5
w = 12/5
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