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r in (-oo:+oo)
-27 = r/12-18 // - r/12-18
18-(r/12)-27 = 0
-1/12*r-9 = 0 // + 9
-1/12*r = 9 // : -1/12
r = 9/(-1/12)
r = -108
r = -108
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