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w in (-oo:+oo)
(-4/5)*w = -16/25 // + -16/25
(-4/5)*w-(-16/25) = 0
(-4/5)*w+16/25 = 0
16/25-4/5*w = 0 // - 16/25
-4/5*w = -16/25 // : -4/5
w = -16/25/(-4/5)
w = 4/5
w = 4/5
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