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n in (-oo:+oo)
3/25-(3000*n) = 4200 // - 4200
3/25-(3000*n)-4200 = 0
3/25-3000*n-4200 = 0
-3000*n-104997/25 = 0 // + 104997/25
-3000*n = 104997/25 // : -3000
n = 104997/25/(-3000)
n = -34999/25000
n = -34999/25000
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