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n in (-oo:+oo)
104 = 5*n+4*n-4 // - 5*n+4*n-4
4-(5*n)-(4*n)+104 = 0
4-5*n-4*n+104 = 0
108-9*n = 0 // - 108
-9*n = -108 // : -9
n = -108/(-9)
n = 12
n = 12
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