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r in (-oo:+oo)
(7/10)*r = 7/9 // - 7/9
(7/10)*r-(7/9) = 0
(7/10)*r-7/9 = 0
7/10*r-7/9 = 0 // + 7/9
7/10*r = 7/9 // : 7/10
r = 7/9/7/10
r = 10/9
r = 10/9
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