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n in (-oo:+oo)
42/18 = n/3 // - n/3
42/18-(n/3) = 0
7/3-1/3*n = 0 // - 7/3
-1/3*n = -7/3 // : -1/3
n = -7/3/(-1/3)
n = 7
n = 7
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