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w in (-oo:+oo)
-1/2 = (2/3)*w-(1/7) // - (2/3)*w-(1/7)
1/7-((2/3)*w)-1/2 = 0
(-2/3)*w-1/2+1/7 = 0
-2/3*w-5/14 = 0 // + 5/14
-2/3*w = 5/14 // : -2/3
w = 5/14/(-2/3)
w = -15/28
w = -15/28
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