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r in (-oo:+oo)
(9*r+1)/2-6 = (6*r+7)/5 // - (6*r+7)/5
(9*r+1)/2-((6*r+7)/5)-6 = 0
(9*r+1)/2+(-1*(6*r+7))/5-6 = 0
(5*(9*r+1))/(2*5)+(-1*2*(6*r+7))/(2*5)+(-6*2*5)/(2*5) = 0
5*(9*r+1)-1*2*(6*r+7)-6*2*5 = 0
33*r-60-9 = 0
33*r-69 = 0
(33*r-69)/(2*5) = 0
(33*r-69)/(2*5) = 0 // * 2*5
33*r-69 = 0
33*r-69 = 0 // + 69
33*r = 69 // : 33
r = 69/33
r = 23/11
r = 23/11
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