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w in (-oo:+oo)
(2/5)*w+1/9 = -71/495 // + -71/495
(2/5)*w+1/9-(-71/495) = 0
(2/5)*w+1/9+71/495 = 0
2/5*w+14/55 = 0 // - 14/55
2/5*w = -14/55 // : 2/5
w = -14/55/2/5
w = -7/11
w = -7/11
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