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n in (-oo:+oo)
3*(8-6*n) = -102 // + 102
3*(8-6*n)+102 = 0
3*(8-6*n)+102 = 0
126-18*n = 0
126-18*n = 0
126-18*n = 0 // - 126
-18*n = -126 // : -18
n = -126/(-18)
n = 7
n = 7
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