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r in (-oo:+oo)
(4*r-2)/5 = 1-(2*r) // - 1-(2*r)
(4*r-2)/5+2*r-1 = 0
(4*r-2)/5+(2*5*r)/5+(-1*5)/5 = 0
4*r+2*5*r-1*5-2 = 0
14*r-5-2 = 0
14*r-7 = 0
(14*r-7)/5 = 0
(14*r-7)/5 = 0 // * 5
14*r-7 = 0
14*r-7 = 0 // + 7
14*r = 7 // : 14
r = 7/14
r = 1/2
r = 1/2
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