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W in (-oo:+oo)
W/7-2.6 = -13.9 // + 13.9
W/7-2.6+13.9 = 0
1/7*W+11.3 = 0 // - 11.3
1/7*W = -11.3 // : 1/7
W = -11.3/1/7
W = -79.10000158
W = -79.10000158
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