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w in (-oo:+oo)
-((1/2)*w)-5/3 = -6/7 // + -6/7
-((1/2)*w)-5/3-(-6/7) = 0
(-1/2)*w-5/3+6/7 = 0
-1/2*w-17/21 = 0 // + 17/21
-1/2*w = 17/21 // : -1/2
w = 17/21/(-1/2)
w = -34/21
w = -34/21
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