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w in (-oo:+oo)
(1/3)*w-(1/2) = -2/5 // + -2/5
(1/3)*w-(1/2)-(-2/5) = 0
(1/3)*w-1/2+2/5 = 0
1/3*w-1/10 = 0 // + 1/10
1/3*w = 1/10 // : 1/3
w = 1/10/1/3
w = 3/10
w = 3/10
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