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w in (-oo:+oo)
-((1/2)*w)-5/7 = -1/5 // + -1/5
-((1/2)*w)-5/7-(-1/5) = 0
(-1/2)*w-5/7+1/5 = 0
-1/2*w-18/35 = 0 // + 18/35
-1/2*w = 18/35 // : -1/2
w = 18/35/(-1/2)
w = -36/35
w = -36/35
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