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r in (-oo:+oo)
12*(r-2) = (8*r-64)/4 // - (8*r-64)/4
12*(r-2)-((8*r-64)/4) = 0
12*(r-2)+(-1*(8*r-64))/4 = 0
(4*12*(r-2))/4+(-1*(8*r-64))/4 = 0
4*12*(r-2)-1*(8*r-64) = 0
40*r-32 = 0
(40*r-32)/4 = 0
(40*r-32)/4 = 0 // * 4
40*r-32 = 0
40*r-32 = 0 // + 32
40*r = 32 // : 40
r = 32/40
r = 4/5
r = 4/5
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