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R in (-oo:+oo)
7/10 = R/8 // - R/8
7/10-(R/8) = 0
7/10-1/8*R = 0 // - 7/10
-1/8*R = -7/10 // : -1/8
R = -7/10/(-1/8)
R = 28/5
R = 28/5
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