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w in (-oo:+oo)
w/25 = 4/7 // - 4/7
w/25-(4/7) = 0
w/25-4/7 = 0
1/25*w-4/7 = 0 // + 4/7
1/25*w = 4/7 // : 1/25
w = 4/7/1/25
w = 100/7
w = 100/7
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