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n in (-oo:+oo)
n-(4*n)+4 = 25/7 // - 25/7
n-(4*n)-(25/7)+4 = 0
n-4*n-25/7+4 = 0
3/7-3*n = 0 // - 3/7
-3*n = -3/7 // : -3
n = -3/7/(-3)
n = 1/7
n = 1/7
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