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w in (-oo:+oo)
(2/5)*w+3/8 = -17/40 // + -17/40
(2/5)*w+3/8-(-17/40) = 0
(2/5)*w+3/8+17/40 = 0
2/5*w+4/5 = 0 // - 4/5
2/5*w = -4/5 // : 2/5
w = -4/5/2/5
w = -2
w = -2
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