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w in (-oo:+oo)
(2*w+8)/7 = w-1 // - w-1
(2*w+8)/7-w+1 = 0
(2*w+8)/7+(7*(-w))/7+(1*7)/7 = 0
2*w+7*(-w)+1*7+8 = 0
7-5*w+8 = 0
15-5*w = 0
(15-5*w)/7 = 0
(15-5*w)/7 = 0 // * 7
15-5*w = 0
15-5*w = 0 // - 15
-5*w = -15 // : -5
w = -15/(-5)
w = 3
w = 3
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