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w in (-oo:+oo)
-4/5 = -2*w // + -2*w
-(-2*w)-4/5 = 0
2*w-4/5 = 0
2*w-4/5 = 0 // + 4/5
2*w = 4/5 // : 2
w = 4/5/2
w = 2/5
w = 2/5
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