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12a.
(4a/5) x (3/a) = (12a/5a) = 12/5 = 2.4
3(a + b) + a = 3a + 3b + a = 4a + 3b
If you mean: 4a-3 = 2a+7 then the value of a works out as 5
4a+3 when a=34(3)+312+3=15So you are substituting(replacing) 'a' with the known value of '3'. You then multiply the '4' with the '3' because of the placing of 'a'.