15abc0 : abc = 1010
(150000 + abc0 ) : abc = 1010
150000 : abc + abc0 : abc = 1010
150000 : abc + 10 = 1010
150000 : abc = 1010 - 10
150000 : abc = 1000
abc = 150000 : 1000
abc = 150
15abc0:abc=1010
(150000+abc0):abc=1010
150000:abc+abc0:abc=1010
150000:abc+10=1010
150000:abc=1010-10
150000:abc=1000
abc=150000:1000
abc=150