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r in (-oo:+oo)
r+2/5 = (4/5)*r+1 // - (4/5)*r+1
r-((4/5)*r)+2/5-1 = 0
r+(-4/5)*r+2/5-1 = 0
1/5*r-3/5 = 0 // + 3/5
1/5*r = 3/5 // : 1/5
r = 3/5/1/5
r = 3
r = 3
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