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w in (-oo:+oo)
-9/2 = 3*w // - 3*w
-(3*w)-9/2 = 0
-3*w-9/2 = 0
-3*w-9/2 = 0 // + 9/2
-3*w = 9/2 // : -3
w = 9/2/(-3)
w = -3/2
w = -3/2
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