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w in (-oo:+oo)
-4/3 = (1/2)*w-(1/5) // - (1/2)*w-(1/5)
1/5-((1/2)*w)-4/3 = 0
(-1/2)*w-4/3+1/5 = 0
-1/2*w-17/15 = 0 // + 17/15
-1/2*w = 17/15 // : -1/2
w = 17/15/(-1/2)
w = -34/15
w = -34/15
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