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r in (-oo:+oo)
(3/8)*r = 1516 // - 1516
(3/8)*r-1516 = 0
3/8*r-1516 = 0 // + 1516
3/8*r = 1516 // : 3/8
r = 1516/3/8
r = 12128/3
r = 12128/3
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