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n in (-oo:+oo)
n-(7*n)-4 = 32 // - 32
n-(7*n)-32-4 = 0
n-7*n-32-4 = 0
-6*n-36 = 0 // + 36
-6*n = 36 // : -6
n = 36/(-6)
n = -6
n = -6
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