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n in (-oo:+oo)
-75 = 3*n+6*n+6 // - 3*n+6*n+6
-(3*n)-(6*n)-75-6 = 0
-3*n-6*n-75-6 = 0
-9*n-81 = 0 // + 81
-9*n = 81 // : -9
n = 81/(-9)
n = -9
n = -9
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