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w in (-oo:+oo)
(-4/5)*w-(1/2) = 2/3 // - 2/3
(-4/5)*w-(1/2)-(2/3) = 0
(-4/5)*w-1/2-2/3 = 0
-4/5*w-7/6 = 0 // + 7/6
-4/5*w = 7/6 // : -4/5
w = 7/6/(-4/5)
w = -35/24
w = -35/24
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