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W in (-oo:+oo)
W/15 = 7/2 // - 7/2
W/15-(7/2) = 0
W/15-7/2 = 0
1/15*W-7/2 = 0 // + 7/2
1/15*W = 7/2 // : 1/15
W = 7/2/1/15
W = 105/2
W = 105/2
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