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w in (-oo:+oo)
(5/7)*w = -5/21 // + -5/21
(5/7)*w-(-5/21) = 0
(5/7)*w+5/21 = 0
5/7*w+5/21 = 0 // - 5/21
5/7*w = -5/21 // : 5/7
w = -5/21/5/7
w = -1/3
w = -1/3
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