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R in (-oo:+oo)
R/(-8) = 13.2 // - 13.2
R/(-8)-13.2 = 0
-1/8*R-13.2 = 0 // + 13.2
-1/8*R = 13.2 // : -1/8
R = 13.2/(-1/8)
R = -105.6
R = -105.6
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