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2000=10(10+19b)
2000=100+190b
1900=190b
b=10
2.000 = 20 : 2 ( 2 × 5 + ( 20 - 1 ) b )
2.000 = 10 ( 10 + 19b )
2.000 = 100 + 190b
190b = 2.000 - 100
190b = 1.900
b = 1.900 : 190
b = 10