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x in (-oo:+oo)
r/4-((r-5)/2) = y-(1/8) // - y-(1/8)
r/4-((r-5)/2)-y+1/8 = 0
(-1*(r-5))/2+r/4-y+1/8 = 0
(-1*4*8*(r-5))/(2*4*8)+(2*8*r)/(2*4*8)+(2*4*8*(-y))/(2*4*8)+(1*2*4)/(2*4*8) = 0
2*8*r-1*4*8*(r-5)+2*4*8*(-y)+1*2*4 = 0
8-16*r-64*y+160 = 0
168-16*r-64*y = 0
(168-16*r-64*y)/(2*4*8) = 0
(168-16*r-64*y)/(2*4*8) = 0 // * 2*4*8
168-16*r-64*y = 0
x belongs to the empty set
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