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w in (-oo:+oo)
-15 = (-5/3)*w // - (-5/3)*w
-((-5/3)*w)-15 = 0
(5/3)*w-15 = 0
5/3*w-15 = 0 // + 15
5/3*w = 15 // : 5/3
w = 15/5/3
w = 9
w = 9
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