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