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r in (-oo:+oo)
0.25 < (1/4)*r // - (1/4)*r
0.25-((1/4)*r) < 0
(-1/4)*r+0.25 < 0
0.25-1/4*r < 0 // - 0.25
-1/4*r < -0.25 // : -1/4
r > -0.25/(-1/4)
r > 1
r in (1:+oo)
(1:+oo)
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