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r in (-oo:+oo)
(7/4)*r = 29/8 // - 29/8
(7/4)*r-(29/8) = 0
(7/4)*r-29/8 = 0
7/4*r-29/8 = 0 // + 29/8
7/4*r = 29/8 // : 7/4
r = 29/8/7/4
r = 29/14
r = 29/14
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