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r in (-oo:+oo)
6*r-3 = (27/5)*r // - (27/5)*r
6*r-((27/5)*r)-3 = 0
6*r+(-27/5)*r-3 = 0
3/5*r-3 = 0 // + 3
3/5*r = 3 // : 3/5
r = 3/3/5
r = 5
r = 5
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