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w in (-oo:+oo)
-8 = (-2/5)*w // - (-2/5)*w
-((-2/5)*w)-8 = 0
(2/5)*w-8 = 0
2/5*w-8 = 0 // + 8
2/5*w = 8 // : 2/5
w = 8/2/5
w = 20
w = 20
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