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n in (-oo:+oo)
20-((2/3)*n) = 12 // - 12
20-((2/3)*n)-12 = 0
(-2/3)*n-12+20 = 0
8-2/3*n = 0 // - 8
-2/3*n = -8 // : -2/3
n = -8/(-2/3)
n = 12
n = 12
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