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n in (-oo:+oo)
7*(-3*n-3) = -273 // + 273
7*(-3*n-3)+273 = 0
7*(-3*n-3)+273 = 0
252-21*n = 0
252-21*n = 0
252-21*n = 0 // - 252
-21*n = -252 // : -21
n = -252/(-21)
n = 12
n = 12
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