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n in (-oo:+oo)
3*(3-7*n) = -222 // + 222
3*(3-7*n)+222 = 0
3*(3-7*n)+222 = 0
231-21*n = 0
231-21*n = 0
231-21*n = 0 // - 231
-21*n = -231 // : -21
n = -231/(-21)
n = 11
n = 11
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