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w in (-oo:+oo)
(w-2)/7 = -2 // + 2
(w-2)/7+2 = 0
(w-2)/7+(2*7)/7 = 0
w+2*7-2 = 0
w+12 = 0
(w+12)/7 = 0
(w+12)/7 = 0 // * 7
w+12 = 0
w+12 = 0 // - 12
w = -12
w = -12
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