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w in (-oo:+oo)
(1/4)*w-((3/4)*w)-1 = 3 // - 3
(1/4)*w-((3/4)*w)-3-1 = 0
(1/4)*w+(-3/4)*w-3-1 = 0
-1/2*w-4 = 0 // + 4
-1/2*w = 4 // : -1/2
w = 4/(-1/2)
w = -8
w = -8
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