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n in (-oo:+oo)
1/5-n = 3/4 // - 3/4
1/5-n-(3/4) = 0
1/5-n-3/4 = 0
-n-11/20 = 0 // + 11/20
-n = 11/20 // * -1
n = -11/20
n = -11/20
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