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R in (-oo:+oo)
4*(R-(2/5)) = 1-(2*R) // - 1-(2*R)
4*(R-(2/5))+2*R-1 = 0
4*(R-2/5)+2*R-1 = 0
4*(R-2/5)+2*R-1 = 0
6*R-8/5-1 = 0
6*R-13/5 = 0
6*R-13/5 = 0
6*R-13/5 = 0 // + 13/5
6*R = 13/5 // : 6
R = 13/5/6
R = 13/30
R = 13/30
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