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w in (-oo:+oo)
-1/2 = (2/3)*w-(3/5) // - (2/3)*w-(3/5)
3/5-((2/3)*w)-1/2 = 0
(-2/3)*w-1/2+3/5 = 0
1/10-2/3*w = 0 // - 1/10
-2/3*w = -1/10 // : -2/3
w = -1/10/(-2/3)
w = 3/20
w = 3/20
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