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