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w in (-oo:+oo)
18 = (3/4)*(2*w-1) // - (3/4)*(2*w-1)
18-((3/4)*(2*w-1)) = 0
(-3/4)*(2*w-1)+18 = 0
18-3/4*(2*w-1) = 0
18-3/4*(2*w-1) = 0
75/4-3/2*w = 0
75/4-3/2*w = 0
75/4-3/2*w = 0 // - 75/4
-3/2*w = -75/4 // : -3/2
w = -75/4/(-3/2)
w = 25/2
w = 25/2
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