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n in (-oo:+oo)
(-1/2)*n-4 = 6 // - 6
(-1/2)*n-6-4 = 0
-1/2*n-10 = 0 // + 10
-1/2*n = 10 // : -1/2
n = 10/(-1/2)
n = -20
n = -20
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