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r in (-oo:+oo)
(3/4)*(r-1) = 6 // - 6
(3/4)*(r-1)-6 = 0
3/4*(r-1)-6 = 0
3/4*(r-1)-6 = 0
3/4*r-27/4 = 0
3/4*r-27/4 = 0
3/4*r-27/4 = 0 // + 27/4
3/4*r = 27/4 // : 3/4
r = 27/4/3/4
r = 9
r = 9
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