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n in (-oo:+oo)
7/12 = n/36 // - n/36
7/12-(n/36) = 0
7/12-1/36*n = 0 // - 7/12
-1/36*n = -7/12 // : -1/36
n = -7/12/(-1/36)
n = 21
n = 21
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