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r in (-oo:+oo)
2*r-(3/7) = 5 // - 5
2*r-(3/7)-5 = 0
2*r-3/7-5 = 0
2*r-38/7 = 0 // + 38/7
2*r = 38/7 // : 2
r = 38/7/2
r = 19/7
r = 19/7
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