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n in (-oo:+oo)
3.8 = n/3-7.2 // - n/3-7.2
3.8-(n/3)+7.2 = 0
11-1/3*n = 0 // - 11
-1/3*n = -11 // : -1/3
n = -11/(-1/3)
n = 33
n = 33
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