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r in (-oo:+oo)
(25/22)*r = r+8 // - r+8
(25/22)*r-r-8 = 0
3/22*r-8 = 0 // + 8
3/22*r = 8 // : 3/22
r = 8/3/22
r = 176/3
r = 176/3
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