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n in (-oo:+oo)
-(3*n)-6 = -69/10 // + -69/10
-(3*n)-(-69/10)-6 = 0
69/10-3*n-6 = 0
9/10-3*n = 0 // - 9/10
-3*n = -9/10 // : -3
n = -9/10/(-3)
n = 3/10
n = 3/10
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