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r in (-oo:+oo)
(3/4)*(2*r-5)-((2/3)*(r-6)) = 1/6 // - 1/6
(3/4)*(2*r-5)-((2/3)*(r-6))-(1/6) = 0
(3/4)*(2*r-5)+(-2/3)*(r-6)-1/6 = 0
3/4*(2*r-5)-2/3*(r-6)-1/6 = 0
(3/4*6*(2*r-5))/6+(-2/3*6*(r-6))/6-1/6 = 0
3/4*6*(2*r-5)-2/3*6*(r-6)-1 = 0
5*r-1+3/2 = 0
5*r+1/2 = 0
(5*r+1/2)/6 = 0
(5*r+1/2)/6 = 0 // * 6
5*r+1/2 = 0
5*r+1/2 = 0 // - 1/2
5*r = -1/2 // : 5
r = -1/2/5
r = -1/10
r = -1/10
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