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n in (-oo:+oo)
-68 = 4*n+6*n+2 // - 4*n+6*n+2
-(4*n)-(6*n)-68-2 = 0
-4*n-6*n-68-2 = 0
-10*n-70 = 0 // + 70
-10*n = 70 // : -10
n = 70/(-10)
n = -7
n = -7
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