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n in (-oo:+oo)
6*(7-3*n) = 78 // - 78
6*(7-3*n)-78 = 0
6*(7-3*n)-78 = 0
-18*n-36 = 0
-18*n-36 = 0
-18*n-36 = 0 // + 36
-18*n = 36 // : -18
n = 36/(-18)
n = -2
n = -2
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