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57600 = 4800*x-(20/100) // - 4800*x-(20/100)
20/100-(4800*x)+57600 = 0
20/100-4800*x+57600 = 0
288001/5-4800*x = 0 // - 288001/5
-4800*x = -288001/5 // : -4800
x = -288001/5/(-4800)
x = 288001/24000
x = 288001/24000
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