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210:6=35
300:6=50
504:6=84
726:6=121
1296:6=216
1806:6=301
3918:6=653
23508:6=3918
30144:6=5024
<span>d - 420 * 15 = 800</span>
<span>d = 800 + 420 * 15
d = 7100</span>
<span>-------------------------
7100 - 420 * 15 = 800
800 = 800 </span>