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w in (-oo:+oo)
w/5.12 = 4 // - 4
w/5.12-4 = 0
0.1953125*w-4 = 0 // + 4
0.1953125*w = 4 // : 0.1953125
w = 4/0.1953125
w = 20.48
w = 20.48
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