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w in (-oo:+oo)
(5/7)*w-1/5 = -132/35 // + -132/35
(5/7)*w-1/5-(-132/35) = 0
(5/7)*w-1/5+132/35 = 0
5/7*w+25/7 = 0 // - 25/7
5/7*w = -25/7 // : 5/7
w = -25/7/5/7
w = -5
w = -5
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