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r in (-oo:+oo)
(1/2)*(4*r+1)-r = (2/5)*(2*r-3)+2/3 // - (2/5)*(2*r-3)+2/3
(1/2)*(4*r+1)-((2/5)*(2*r-3))-r-(2/3) = 0
(1/2)*(4*r+1)+(-2/5)*(2*r-3)-r-2/3 = 0
1/2*(4*r+1)-2/5*(2*r-3)-r-2/3 = 0
(1/2*3*(4*r+1))/3+(-2/5*3*(2*r-3))/3+(3*(-r))/3-2/3 = 0
1/2*3*(4*r+1)-2/5*3*(2*r-3)+3*(-r)-2 = 0
18/5*r-3*r-2+51/10 = 0
3/5*r-2+51/10 = 0
3/5*r+31/10 = 0
(3/5*r+31/10)/3 = 0
(3/5*r+31/10)/3 = 0 // * 3
3/5*r+31/10 = 0
3/5*r+31/10 = 0 // - 31/10
3/5*r = -31/10 // : 3/5
r = -31/10/3/5
r = -31/6
r = -31/6
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