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R in (-oo:+oo)
4*R-(7/3) = 1 // - 1
4*R-(7/3)-1 = 0
4*R-7/3-1 = 0
4*R-10/3 = 0 // + 10/3
4*R = 10/3 // : 4
R = 10/3/4
R = 5/6
R = 5/6
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