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n in (-oo:+oo)
6*(10-3*n) = -102 // + 102
6*(10-3*n)+102 = 0
6*(10-3*n)+102 = 0
162-18*n = 0
162-18*n = 0
162-18*n = 0 // - 162
-18*n = -162 // : -18
n = -162/(-18)
n = 9
n = 9
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