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n in (-oo:+oo)
35/45 = n/9 // - n/9
35/45-(n/9) = 0
7/9-1/9*n = 0 // - 7/9
-1/9*n = -7/9 // : -1/9
n = -7/9/(-1/9)
n = 7
n = 7
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