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n in (-oo:+oo)
3*(6-3*n) = 36 // - 36
3*(6-3*n)-36 = 0
3*(6-3*n)-36 = 0
-9*n-18 = 0
-9*n-18 = 0
-9*n-18 = 0 // + 18
-9*n = 18 // : -9
n = 18/(-9)
n = -2
n = -2
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