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n in (-oo:+oo)
9-(4*n) = 4*n-39 // - 4*n-39
9-(4*n)-(4*n)+39 = 0
9-4*n-4*n+39 = 0
48-8*n = 0 // - 48
-8*n = -48 // : -8
n = -48/(-8)
n = 6
n = 6
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