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w in (-oo:+oo)
25 = (-5/3)*w // - (-5/3)*w
25-((-5/3)*w) = 0
(5/3)*w+25 = 0
5/3*w+25 = 0 // - 25
5/3*w = -25 // : 5/3
w = -25/5/3
w = -15
w = -15
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