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w in (-oo:+oo)
7*w = 14/5 // - 14/5
7*w-(14/5) = 0
7*w-14/5 = 0
7*w-14/5 = 0 // + 14/5
7*w = 14/5 // : 7
w = 14/5/7
w = 2/5
w = 2/5
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