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w in (-oo:+oo)
w/13 = -6.2 // + 6.2
w/13+6.2 = 0
1/13*w+6.2 = 0 // - 6.2
1/13*w = -6.2 // : 1/13
w = -6.2/1/13
w = -80.59999678
w = -80.59999678
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