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w in (-oo:+oo)
(-1/2)*w-(1/5) = 1/7 // - 1/7
(-1/2)*w-(1/5)-(1/7) = 0
(-1/2)*w-1/5-1/7 = 0
-1/2*w-12/35 = 0 // + 12/35
-1/2*w = 12/35 // : -1/2
w = 12/35/(-1/2)
w = -24/35
w = -24/35
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