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W in (-oo:+oo)
W/15 = 7/15 // - 7/15
W/15-(7/15) = 0
W/15-7/15 = 0
1/15*W-7/15 = 0 // + 7/15
1/15*W = 7/15 // : 1/15
W = 7/15/1/15
W = 7
W = 7
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