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w in (-oo:+oo)
(6/7)*w+w+1 = 20/7 // - 20/7
(6/7)*w+w-(20/7)+1 = 0
(6/7)*w+w-20/7+1 = 0
13/7*w-13/7 = 0 // + 13/7
13/7*w = 13/7 // : 13/7
w = 13/7/13/7
w = 1
w = 1
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