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