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n in (-oo:+oo)
-3*n-4 = 7*n+96 // - 7*n+96
-3*n-(7*n)-96-4 = 0
-3*n-7*n-96-4 = 0
-10*n-100 = 0 // + 100
-10*n = 100 // : -10
n = 100/(-10)
n = -10
n = -10
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