abc6-2889=6abc
abcx10+6-2889=6000+abcx1
abcx10+6-abcx1=6000+2889
abcx(10-1)+6=8889
abcx9+6=8889
abcx9=8889-6
abcx9=8883
abc=8883:9
abc=987
=>abc=987
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