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w in (-oo:+oo)
99/2 = 6*w-w-(1/2) // - 6*w-w-(1/2)
w-(6*w)+99/2+1/2 = 0
w-6*w+99/2+1/2 = 0
50-5*w = 0 // - 50
-5*w = -50 // : -5
w = -50/(-5)
w = 10
w = 10
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