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w in (-oo:+oo)
-35 = (-7/5)*w // - (-7/5)*w
-((-7/5)*w)-35 = 0
(7/5)*w-35 = 0
7/5*w-35 = 0 // + 35
7/5*w = 35 // : 7/5
w = 35/7/5
w = 25
w = 25
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