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w in (-oo:+oo)
5*w = 20/7 // - 20/7
5*w-(20/7) = 0
5*w-20/7 = 0
5*w-20/7 = 0 // + 20/7
5*w = 20/7 // : 5
w = 20/7/5
w = 4/7
w = 4/7
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