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n in (-oo:+oo)
-((2/3)*n)-1/5 = 6*n-(1/5) // - 6*n-(1/5)
1/5-((2/3)*n)-(6*n)-1/5 = 0
(-2/3)*n-6*n-1/5+1/5 = 0
-20/3*n = 0 // : -20/3
n = 0
n = 0
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