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n in (-oo:+oo)
9-(n/5) = 4*n // - 4*n
9-(n/5)-(4*n) = 0
9-(n/5)-4*n = 0
9-21/5*n = 0 // - 9
-21/5*n = -9 // : -21/5
n = -9/(-21/5)
n = 15/7
n = 15/7
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