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w in (-oo:+oo)
(5/7)*w = -5/28 // + -5/28
(5/7)*w-(-5/28) = 0
(5/7)*w+5/28 = 0
5/7*w+5/28 = 0 // - 5/28
5/7*w = -5/28 // : 5/7
w = -5/28/5/7
w = -1/4
w = -1/4
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