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r in (-oo:+oo)
(4*(2*r-4))/3 = 4*r-(3/4) // - 4*r-(3/4)
(4*(2*r-4))/3-(4*r)+3/4 = 0
(4*(2*r-4))/3-4*r+3/4 = 0
(4^2*(2*r-4))/(3*4)+(-4*3*4*r)/(3*4)+(3^2)/(3*4) = 0
4^2*(2*r-4)-4*3*4*r+9 = 0
9-16*r-64 = 0
-16*r-55 = 0
(-16*r-55)/(3*4) = 0
(-16*r-55)/(3*4) = 0 // * 3*4
-16*r-55 = 0
-16*r-55 = 0 // + 55
-16*r = 55 // : -16
r = 55/(-16)
r = -55/16
r = -55/16
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