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n in (-oo:+oo)
-(6*n)-((1/5)*n)-4 = -206/5 // + -206/5
-(6*n)-((1/5)*n)-(-206/5)-4 = 0
(-1/5)*n-6*n+206/5-4 = 0
186/5-31/5*n = 0 // - 186/5
-31/5*n = -186/5 // : -31/5
n = -186/5/(-31/5)
n = 6
n = 6
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