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n in (-oo:+oo)
4-(6*n)-(4*n) = 104 // - 104
4-(6*n)-(4*n)-104 = 0
4-6*n-4*n-104 = 0
-10*n-100 = 0 // + 100
-10*n = 100 // : -10
n = 100/(-10)
n = -10
n = -10
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