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w in (-oo:+oo)
(w-5)/(-4) = -8 // + 8
(w-5)/(-4)+8 = 0
(w-5)/(-4)+(-4*8)/(-4) = 0
w-4*8-5 = 0
w-37 = 0
(w-37)/(-4) = 0
(w-37)/(-4) = 0 // * -4
w-37 = 0
w-37 = 0 // + 37
w = 37
w = 37
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