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r in (-oo:+oo)
r/5 = 12/5 // - 12/5
r/5-(12/5) = 0
r/5-12/5 = 0
1/5*r-12/5 = 0 // + 12/5
1/5*r = 12/5 // : 1/5
r = 12/5/1/5
r = 12
r = 12
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