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w in (-oo:+oo)
15/4 = 3*w // - 3*w
15/4-(3*w) = 0
15/4-3*w = 0
15/4-3*w = 0 // - 15/4
-3*w = -15/4 // : -3
w = -15/4/(-3)
w = 5/4
w = 5/4
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