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r in (-oo:+oo)
10/2 = (5/2)*r // - (5/2)*r
10/2-((5/2)*r) = 0
(-5/2)*r+10/2 = 0
5-5/2*r = 0 // - 5
-5/2*r = -5 // : -5/2
r = -5/(-5/2)
r = 2
r = 2
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