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w in (-oo:+oo)
(1/5)*w+3/7 = 22/35 // - 22/35
(1/5)*w+3/7-(22/35) = 0
(1/5)*w+3/7-22/35 = 0
1/5*w-1/5 = 0 // + 1/5
1/5*w = 1/5 // : 1/5
w = 1/5/1/5
w = 1
w = 1
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