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w in (-oo:+oo)
8 = (-4/5)*w // - (-4/5)*w
8-((-4/5)*w) = 0
(4/5)*w+8 = 0
4/5*w+8 = 0 // - 8
4/5*w = -8 // : 4/5
w = -8/4/5
w = -10
w = -10
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