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w in (-oo:+oo)
(-3/5)*w+1 = 17/5 // - 17/5
(-3/5)*w-(17/5)+1 = 0
(-3/5)*w-17/5+1 = 0
-3/5*w-12/5 = 0 // + 12/5
-3/5*w = 12/5 // : -3/5
w = 12/5/(-3/5)
w = -4
w = -4
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