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r in (-oo:+oo)
-(2-((2*r)/3)) = 7-((13*r)/3) // - 7-((13*r)/3)
(2*r)/3+(13*r)/3-7-2 = 0
5*r-9 = 0 // + 9
5*r = 9 // : 5
r = 9/5
r = 9/5
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