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r in (-oo:+oo)
(5/7)*r-2 = -1 // + 1
(5/7)*r-2+1 = 0
5/7*r-1 = 0 // + 1
5/7*r = 1 // : 5/7
r = 1/5/7
r = 7/5
r = 7/5
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