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w in (-oo:+oo)
(-1/4)*w-3 = w // - w
(-1/4)*w-w-3 = 0
-5/4*w-3 = 0 // + 3
-5/4*w = 3 // : -5/4
w = 3/(-5/4)
w = -12/5
w = -12/5
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