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r in (-oo:+oo)
r/3 = 18/7 // - 18/7
r/3-(18/7) = 0
r/3-18/7 = 0
1/3*r-18/7 = 0 // + 18/7
1/3*r = 18/7 // : 1/3
r = 18/7/1/3
r = 54/7
r = 54/7
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