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w in (-oo:+oo)
5-((1/3)*w) = 21/4 // - 21/4
5-((1/3)*w)-(21/4) = 0
(-1/3)*w-21/4+5 = 0
-1/3*w-1/4 = 0 // + 1/4
-1/3*w = 1/4 // : -1/3
w = 1/4/(-1/3)
w = -3/4
w = -3/4
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