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r in (-oo:+oo)
12*r-(53/6) = 2*(r-(3/4))-8 // - 2*(r-(3/4))-8
12*r-(2*(r-(3/4)))-(53/6)+8 = 0
12*r-2*(r-3/4)-53/6+8 = 0
(-2*6*(r-3/4))/6+(6*12*r)/6-53/6+(6*8)/6 = 0
6*12*r-2*6*(r-3/4)+6*8-53 = 0
60*r-53+9+48 = 0
60*r-44+48 = 0
60*r+4 = 0
(60*r+4)/6 = 0
(60*r+4)/6 = 0 // * 6
60*r+4 = 0
60*r+4 = 0 // - 4
60*r = -4 // : 60
r = -4/60
r = -1/15
r = -1/15
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