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r in (-oo:+oo)
r/7 = 5/6 // - 5/6
r/7-(5/6) = 0
r/7-5/6 = 0
1/7*r-5/6 = 0 // + 5/6
1/7*r = 5/6 // : 1/7
r = 5/6/1/7
r = 35/6
r = 35/6
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