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r in (-oo:+oo)
(4*r-7)/3 = 1 // - 1
(4*r-7)/3-1 = 0
(4*r-7)/3+(-1*3)/3 = 0
4*r-1*3-7 = 0
4*r-10 = 0
(4*r-10)/3 = 0
(4*r-10)/3 = 0 // * 3
4*r-10 = 0
4*r-10 = 0 // + 10
4*r = 10 // : 4
r = 10/4
r = 5/2
r = 5/2
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