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r in (-oo:+oo)
r/4 = 7/3 // - 7/3
r/4-(7/3) = 0
r/4-7/3 = 0
1/4*r-7/3 = 0 // + 7/3
1/4*r = 7/3 // : 1/4
r = 7/3/1/4
r = 28/3
r = 28/3
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