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w in (-oo:+oo)
(1/3)*w+(1/5)*w+1/4 = 23/60 // - 23/60
(1/3)*w+(1/5)*w+1/4-(23/60) = 0
(1/3)*w+(1/5)*w+1/4-23/60 = 0
8/15*w-2/15 = 0 // + 2/15
8/15*w = 2/15 // : 8/15
w = 2/15/8/15
w = 1/4
w = 1/4
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