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r in (-oo:+oo)
2*r+r-5 = (13/2)*r // - (13/2)*r
2*r+r-((13/2)*r)-5 = 0
2*r+r+(-13/2)*r-5 = 0
-7/2*r-5 = 0 // + 5
-7/2*r = 5 // : -7/2
r = 5/(-7/2)
r = -10/7
r = -10/7
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