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w in (-oo:+oo)
-1/7 = (1/2)*w-(2/3) // - (1/2)*w-(2/3)
2/3-((1/2)*w)-1/7 = 0
(-1/2)*w-1/7+2/3 = 0
11/21-1/2*w = 0 // - 11/21
-1/2*w = -11/21 // : -1/2
w = -11/21/(-1/2)
w = 22/21
w = 22/21
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