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n in (-oo:+oo)
233/28 = n+(2/7)*n+8 // - n+(2/7)*n+8
233/28-n-((2/7)*n)-8 = 0
(-2/7)*n-n+233/28-8 = 0
9/28-9/7*n = 0 // - 9/28
-9/7*n = -9/28 // : -9/7
n = -9/28/(-9/7)
n = 1/4
n = 1/4
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