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w in (-oo:+oo)
-20 = (-4/7)*w // - (-4/7)*w
-((-4/7)*w)-20 = 0
(4/7)*w-20 = 0
4/7*w-20 = 0 // + 20
4/7*w = 20 // : 4/7
w = 20/4/7
w = 35
w = 35
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