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W in (-oo:+oo)
W/7+9.1 = -13.3 // + 13.3
W/7+9.1+13.3 = 0
1/7*W+22.4 = 0 // - 22.4
1/7*W = -22.4 // : 1/7
W = -22.4/1/7
W = -156.80000314
W = -156.80000314
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