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w in (-oo:+oo)
(-3/5)*w-(5/2) = 3*w-(1/5) // - 3*w-(1/5)
(-3/5)*w-(3*w)-(5/2)+1/5 = 0
(-3/5)*w-3*w-5/2+1/5 = 0
-18/5*w-23/10 = 0 // + 23/10
-18/5*w = 23/10 // : -18/5
w = 23/10/(-18/5)
w = -23/36
w = -23/36
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