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