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