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n in (-oo:+oo)
2-3*n-(6*n) = -97 // + 97
2-3*n-(6*n)+97 = 0
2-3*n-6*n+97 = 0
99-9*n = 0 // - 99
-9*n = -99 // : -9
n = -99/(-9)
n = 11
n = 11
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