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r in (-oo:+oo)
-59/60 = (1/6)*((-4/3)*r-5) // - (1/6)*((-4/3)*r-5)
-((1/6)*((-4/3)*r-5))-59/60 = 0
(-1/6)*((-4/3)*r-5)-59/60 = 0
-1/6*(-4/3*r-5)-59/60 = 0
(-1/6*60*(-4/3*r-5))/60-59/60 = 0
-1/6*60*(-4/3*r-5)-59 = 0
40/3*r-9 = 0
(40/3*r-9)/60 = 0
(40/3*r-9)/60 = 0 // * 60
40/3*r-9 = 0
40/3*r-9 = 0 // + 9
40/3*r = 9 // : 40/3
r = 9/40/3
r = 27/40
r = 27/40
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