a = 5.20 = 100
7+10a = b
b = 7+10.100
b = 7+1000 = 1007
b.(2a+a) = b.3a
= 1007.300
b(2a+a) = 302100
ab - (a+b) = 100.1007 - (100+1007)
= 100.1007 - 100 - 1007
= 100.1007 - 1007 - 100
= 1007(100-1) - 100
= 1007.99 - 100
ab-(a+b) = 99593
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a = 5.20 = 100
7+10a = b
b = 7+10.100
b = 7+1000 = 1007
b.(2a+a) = b.3a
= 1007.300
b(2a+a) = 302100
ab - (a+b) = 100.1007 - (100+1007)
= 100.1007 - 100 - 1007
= 100.1007 - 1007 - 100
= 1007(100-1) - 100
= 1007.99 - 100
ab-(a+b) = 99593