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w in (-oo:+oo)
393/8 = 6*w-((1/2)*w)-(3/8) // - 6*w-((1/2)*w)-(3/8)
(1/2)*w-(6*w)+393/8+3/8 = 0
(1/2)*w-6*w+393/8+3/8 = 0
99/2-11/2*w = 0 // - 99/2
-11/2*w = -99/2 // : -11/2
w = -99/2/(-11/2)
w = 9
w = 9
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