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n in (-oo:+oo)
8-(1*n) = 4/21 // - 4/21
8-(1*n)-(4/21) = 0
8-n-4/21 = 0
164/21-n = 0 // - 164/21
-n = -164/21 // * -1
n = 164/21
n = 164/21
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