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r in (-oo:+oo)
r/2 = 9/6 // - 9/6
r/2-(9/6) = 0
r/2-3/2 = 0
1/2*r-3/2 = 0 // + 3/2
1/2*r = 3/2 // : 1/2
r = 3/2/1/2
r = 3
r = 3
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