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n in (-oo:+oo)
-(2*n)-6 = 4*n-30 // - 4*n-30
30-(2*n)-(4*n)-6 = 0
30-2*n-4*n-6 = 0
24-6*n = 0 // - 24
-6*n = -24 // : -6
n = -24/(-6)
n = 4
n = 4
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