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