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r in (-oo:+oo)
(1/2)*r+1/4 = 4 // - 4
(1/2)*r+1/4-4 = 0
1/2*r-15/4 = 0 // + 15/4
1/2*r = 15/4 // : 1/2
r = 15/4/1/2
r = 15/2
r = 15/2
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