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n in (-oo:+oo)
124 = 6*n+5*n+3 // - 6*n+5*n+3
124-(6*n)-(5*n)-3 = 0
124-6*n-5*n-3 = 0
121-11*n = 0 // - 121
-11*n = -121 // : -11
n = -121/(-11)
n = 11
n = 11
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