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w in (-oo:+oo)
(1/9)*w+(2/7)*w = 1 // - 1
(1/9)*w+(2/7)*w-1 = 0
25/63*w-1 = 0 // + 1
25/63*w = 1 // : 25/63
w = 1/25/63
w = 63/25
w = 63/25
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