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R in (-oo:+oo)
R/3 = 1/4 // - 1/4
R/3-(1/4) = 0
R/3-1/4 = 0
1/3*R-1/4 = 0 // + 1/4
1/3*R = 1/4 // : 1/3
R = 1/4/1/3
R = 3/4
R = 3/4
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