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W in (-oo:+oo)
W/7 = 11.2 // - 11.2
W/7-11.2 = 0
1/7*W-11.2 = 0 // + 11.2
1/7*W = 11.2 // : 1/7
W = 11.2/1/7
W = 78.40000157
W = 78.40000157
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