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x in (-oo:+oo)
m = (h-w)/8 // - (h-w)/8
m-((h-w)/8) = 0
(-1*(h-w))/8+m = 0
(-1*(h-w))/8+(8*m)/8 = 0
8*m-1*(h-w) = 0
8*m-h+w = 0
(8*m-h+w)/8 = 0
(8*m-h+w)/8 = 0 // * 8
8*m-h+w = 0
x belongs to the empty set
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