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r in (-oo:+oo)
(12*r-53)/6 = 2*(r-(3/4))-8 // - 2*(r-(3/4))-8
(12*r-53)/6-(2*(r-(3/4)))+8 = 0
(12*r-53)/6-2*(r-3/4)+8 = 0
(12*r-53)/6+(-2*6*(r-3/4))/6+(6*8)/6 = 0
12*r-2*6*(r-3/4)+6*8-53 = 0
48-44 = 0
4 = 0
4/6 = 0
4/6 = 0 // * 6
4 = 0
4 = 0
r belongs to the empty set
r belongs to the empty set
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