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w in (-oo:+oo)
(2/7)*w-5 = (4/7)*w-1 // - (4/7)*w-1
(2/7)*w-((4/7)*w)-5+1 = 0
(2/7)*w+(-4/7)*w-5+1 = 0
-2/7*w-4 = 0 // + 4
-2/7*w = 4 // : -2/7
w = 4/(-2/7)
w = -14
w = -14
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