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n in (-oo:+oo)
12 = (2*n)/3 // - (2*n)/3
12-((2*n)/3) = 0
(-2/3)*n+12 = 0
12-2/3*n = 0 // - 12
-2/3*n = -12 // : -2/3
n = -12/(-2/3)
n = 18
n = 18
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