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r in (-oo:+oo)
r/6 = 52/3 // - 52/3
r/6-(52/3) = 0
r/6-52/3 = 0
1/6*r-52/3 = 0 // + 52/3
1/6*r = 52/3 // : 1/6
r = 52/3/1/6
r = 104
r = 104
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