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r in (-oo:+oo)
(1/8)*(64*r+32) = (1/2)*(16*r-8) // - (1/2)*(16*r-8)
(1/8)*(64*r+32)-((1/2)*(16*r-8)) = 0
(1/8)*(64*r+32)+(-1/2)*(16*r-8) = 0
1/8*(64*r+32)-1/2*(16*r-8) = 0
1/8*(64*r+32)-1/2*(16*r-8) = 0
8 = 0
8 = 0
r belongs to the empty set
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