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r in (-oo:+oo)
(1/4)*(r-(5/2)) = 1/8 // - 1/8
(1/4)*(r-(5/2))-(1/8) = 0
(1/4)*(r-5/2)-1/8 = 0
1/4*(r-5/2)-1/8 = 0
(1/4*8*(r-5/2))/8-1/8 = 0
1/4*8*(r-5/2)-1 = 0
2*r-6 = 0
(2*r-6)/8 = 0
(2*r-6)/8 = 0 // * 8
2*r-6 = 0
2*r-6 = 0 // + 6
2*r = 6 // : 2
r = 6/2
r = 3
r = 3
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