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w in (-oo:+oo)
(-2/1)*w-(3/5) = (1/5)*w // - (1/5)*w
(-2/1)*w-((1/5)*w)-(3/5) = 0
(-1/5)*w-2*w-3/5 = 0
-11/5*w-3/5 = 0 // + 3/5
-11/5*w = 3/5 // : -11/5
w = 3/5/(-11/5)
w = -3/11
w = -3/11
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