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w in (-oo:+oo)
w/25 = 0.7 // - 0.7
w/25-0.7 = 0
1/25*w-0.7 = 0 // + 0.7
1/25*w = 0.7 // : 1/25
w = 0.7/1/25
w = 17.5
w = 17.5
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