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w in (-oo:+oo)
w/3.9 = 1.2 // - 1.2
w/3.9-1.2 = 0
0.25641026*w-1.2 = 0 // + 1.2
0.25641026*w = 1.2 // : 0.25641026
w = 1.2/0.25641026
w = 4.67999993
w = 4.67999993
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