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w in (-oo:+oo)
(w-2)/5 = 2 // - 2
(w-2)/5-2 = 0
(w-2)/5+(-2*5)/5 = 0
w-2*5-2 = 0
w-12 = 0
(w-12)/5 = 0
(w-12)/5 = 0 // * 5
w-12 = 0
w-12 = 0 // + 12
w = 12
w = 12
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