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r in (-oo:+oo)
(1/4)*(4*r-1) = 2*r+1/8 // - 2*r+1/8
(1/4)*(4*r-1)-(2*r)-(1/8) = 0
(1/4)*(4*r-1)-2*r-1/8 = 0
1/4*(4*r-1)-2*r-1/8 = 0
(1/4*8*(4*r-1))/8+(-2*8*r)/8-1/8 = 0
1/4*8*(4*r-1)-2*8*r-1 = 0
-8*r-2-1 = 0
-8*r-3 = 0
(-8*r-3)/8 = 0
(-8*r-3)/8 = 0 // * 8
-8*r-3 = 0
-8*r-3 = 0 // + 3
-8*r = 3 // : -8
r = 3/(-8)
r = -3/8
r = -3/8
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