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n in (-oo:+oo)
7*n-(5*n)-6 = -30 // + 30
7*n-(5*n)-6+30 = 0
7*n-5*n-6+30 = 0
2*n+24 = 0 // - 24
2*n = -24 // : 2
n = -24/2
n = -12
n = -12
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