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w in (-oo:+oo)
w/30 = 15/40 // - 15/40
w/30-(15/40) = 0
w/30-3/8 = 0
1/30*w-3/8 = 0 // + 3/8
1/30*w = 3/8 // : 1/30
w = 3/8/1/30
w = 45/4
w = 45/4
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