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n in (-oo:+oo)
-5*n-6 = 2*n-90 // - 2*n-90
90-5*n-(2*n)-6 = 0
90-5*n-2*n-6 = 0
84-7*n = 0 // - 84
-7*n = -84 // : -7
n = -84/(-7)
n = 12
n = 12
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