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r in (-oo:+oo)
(3/4)*r-(2/3) = 5/6 // - 5/6
(3/4)*r-(2/3)-(5/6) = 0
(3/4)*r-2/3-5/6 = 0
3/4*r-3/2 = 0 // + 3/2
3/4*r = 3/2 // : 3/4
r = 3/2/3/4
r = 2
r = 2
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