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r in (-oo:+oo)
-11 = (8/7)*r+29 // - (8/7)*r+29
-((8/7)*r)-29-11 = 0
(-8/7)*r-29-11 = 0
-8/7*r-40 = 0 // + 40
-8/7*r = 40 // : -8/7
r = 40/(-8/7)
r = -35
r = -35
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