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r in (-oo:+oo)
8*r+6/7-(9/7) = 0
8*r+6/7-9/7 = 0
8*r-3/7 = 0 // + 3/7
8*r = 3/7 // : 8
r = 3/7/8
r = 3/56
r = 3/56
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