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