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w in (-oo:+oo)
15 = (-5/9)*w // - (-5/9)*w
15-((-5/9)*w) = 0
(5/9)*w+15 = 0
5/9*w+15 = 0 // - 15
5/9*w = -15 // : 5/9
w = -15/5/9
w = -27
w = -27
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