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R in (-oo:+oo)
3/4 = R/23 // - R/23
3/4-(R/23) = 0
3/4-1/23*R = 0 // - 3/4
-1/23*R = -3/4 // : -1/23
R = -3/4/(-1/23)
R = 69/4
R = 69/4
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