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w in (-oo:+oo)
5*w = 15/7 // - 15/7
5*w-(15/7) = 0
5*w-15/7 = 0
5*w-15/7 = 0 // + 15/7
5*w = 15/7 // : 5
w = 15/7/5
w = 3/7
w = 3/7
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