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w in (-oo:+oo)
15 = (-3/7)*w // - (-3/7)*w
15-((-3/7)*w) = 0
(3/7)*w+15 = 0
3/7*w+15 = 0 // - 15
3/7*w = -15 // : 3/7
w = -15/3/7
w = -35
w = -35
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