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R in (-oo:+oo)
R/21 = 3/63 // - 3/63
R/21-(3/63) = 0
R/21-1/21 = 0
1/21*R-1/21 = 0 // + 1/21
1/21*R = 1/21 // : 1/21
R = 1/21/1/21
R = 1
R = 1
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