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w in (-oo:+oo)
-15 = (-5/2)*w // - (-5/2)*w
-((-5/2)*w)-15 = 0
(5/2)*w-15 = 0
5/2*w-15 = 0 // + 15
5/2*w = 15 // : 5/2
w = 15/5/2
w = 6
w = 6
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