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r in (-oo:+oo)
5/4-(8*r) = -211/36 // + -211/36
5/4-(8*r)-(-211/36) = 0
5/4-8*r+211/36 = 0
64/9-8*r = 0 // - 64/9
-8*r = -64/9 // : -8
r = -64/9/(-8)
r = 8/9
r = 8/9
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