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n in (-oo:+oo)
(3*n)/5 = 5*n-198 // - 5*n-198
(3*n)/5-(5*n)+198 = 0
(3*n)/5-5*n+198 = 0
198-22/5*n = 0 // - 198
-22/5*n = -198 // : -22/5
n = -198/(-22/5)
n = 45
n = 45
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