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r in (-oo:+oo)
(1/2)*r = 7407 // - 7407
(1/2)*r-7407 = 0
1/2*r-7407 = 0 // + 7407
1/2*r = 7407 // : 1/2
r = 7407/1/2
r = 14814
r = 14814
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