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w in (-oo:+oo)
(4*w)/5-(3/10) = 0
(4*w)/5-3/10 = 0
4/5*w-3/10 = 0 // + 3/10
4/5*w = 3/10 // : 4/5
w = 3/10/4/5
w = 3/8
w = 3/8
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