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r in (-oo:+oo)
(5*r)/9 = 4*r-186 // - 4*r-186
(5*r)/9-(4*r)+186 = 0
(5*r)/9-4*r+186 = 0
186-31/9*r = 0 // - 186
-31/9*r = -186 // : -31/9
r = -186/(-31/9)
r = 54
r = 54
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