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w in (-oo:+oo)
-((1/2)*w)-2/7 = 2/3 // - 2/3
-((1/2)*w)-2/7-(2/3) = 0
(-1/2)*w-2/7-2/3 = 0
-1/2*w-20/21 = 0 // + 20/21
-1/2*w = 20/21 // : -1/2
w = 20/21/(-1/2)
w = -40/21
w = -40/21
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