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w in (-oo:+oo)
15 = (-1/5)*w // - (-1/5)*w
15-((-1/5)*w) = 0
(1/5)*w+15 = 0
1/5*w+15 = 0 // - 15
1/5*w = -15 // : 1/5
w = -15/1/5
w = -75
w = -75
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