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w in (-oo:+oo)
9/5-(8*w) = 8*(3/5-w) // - 8*(3/5-w)
9/5-(8*(3/5-w))-(8*w) = 0
9/5-8*(3/5-w)-8*w = 0
(-8*5*(3/5-w))/5+(-8*5*w)/5+9/5 = 0
9-8*5*(3/5-w)-8*5*w = 0
9-24 = 0
-15 = 0
-15/5 = 0
-15/5 = 0 // * 5
-15 = 0
w belongs to the empty set
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