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