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n in (-oo:+oo)
7/4-n = 11/20 // - 11/20
7/4-n-(11/20) = 0
7/4-n-11/20 = 0
6/5-n = 0 // - 6/5
-n = -6/5 // * -1
n = 6/5
n = 6/5
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