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r in (-oo:+oo)
-27 = r/12-19 // - r/12-19
19-(r/12)-27 = 0
-1/12*r-8 = 0 // + 8
-1/12*r = 8 // : -1/12
r = 8/(-1/12)
r = -96
r = -96
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