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n in (-oo:+oo)
27/36 = n/12 // - n/12
27/36-(n/12) = 0
3/4-1/12*n = 0 // - 3/4
-1/12*n = -3/4 // : -1/12
n = -3/4/(-1/12)
n = 9
n = 9
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