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R in (-oo:+oo)
2*R-(1/5) = 1-((2*R)/2) // - 1-((2*R)/2)
2*R+(2*R)/2-(1/5)-1 = 0
2*R+(2*R)/2-1/5-1 = 0
3*R-6/5 = 0 // + 6/5
3*R = 6/5 // : 3
R = 6/5/3
R = 2/5
R = 2/5
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