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r in (-oo:+oo)
2.6 = (5*r)/3 // - (5*r)/3
2.6-((5*r)/3) = 0
(-5/3)*r+2.6 = 0
2.6-5/3*r = 0 // - 2.6
-5/3*r = -2.6 // : -5/3
r = -2.6/(-5/3)
r = 1.56
r = 1.56
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