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r in (-oo:+oo)
r/5 = 18/6 // - 18/6
r/5-(18/6) = 0
r/5-3 = 0
1/5*r-3 = 0 // + 3
1/5*r = 3 // : 1/5
r = 3/1/5
r = 15
r = 15
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