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r in (-oo:+oo)
(5/6)*r-(3*r) = (-3/4)*r+11/4 // - (-3/4)*r+11/4
(5/6)*r-(3*r)-((-3/4)*r)-(11/4) = 0
(5/6)*r-3*r+(3/4)*r-11/4 = 0
-17/12*r-11/4 = 0 // + 11/4
-17/12*r = 11/4 // : -17/12
r = 11/4/(-17/12)
r = -33/17
r = -33/17
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