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n in (-oo:+oo)
1/2 = n/19 // - n/19
1/2-(n/19) = 0
1/2-1/19*n = 0 // - 1/2
-1/19*n = -1/2 // : -1/19
n = -1/2/(-1/19)
n = 19/2
n = 19/2
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