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r in (-oo:+oo)
(1/3)*r = 6/7 // - 6/7
(1/3)*r-(6/7) = 0
(1/3)*r-6/7 = 0
1/3*r-6/7 = 0 // + 6/7
1/3*r = 6/7 // : 1/3
r = 6/7/1/3
r = 18/7
r = 18/7
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