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n in (-oo:+oo)
-102 = 5*n+4*n+6 // - 5*n+4*n+6
-(5*n)-(4*n)-102-6 = 0
-5*n-4*n-102-6 = 0
-9*n-108 = 0 // + 108
-9*n = 108 // : -9
n = 108/(-9)
n = -12
n = -12
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