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w in (-oo:+oo)
w/12.8 = 2 // - 2
w/12.8-2 = 0
0.078125*w-2 = 0 // + 2
0.078125*w = 2 // : 0.078125
w = 2/0.078125
w = 25.6
w = 25.6
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