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r in (-oo:+oo)
(1/4)*r-(1/4) = 3/2 // - 3/2
(1/4)*r-(1/4)-(3/2) = 0
(1/4)*r-1/4-3/2 = 0
1/4*r-7/4 = 0 // + 7/4
1/4*r = 7/4 // : 1/4
r = 7/4/1/4
r = 7
r = 7
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