It is an equation and the value of a is 7
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4a - 9 = 27 4a = 36 a = 9
-4a = 48 a = -12
4a+5=25 4a=25-5 4a=20 a=20/4 a=5
The Answer is 4a so you are asking why it is 4a. So just take an a and think it as 1a boom
4a + a = 25 add 4a and a 5a = 25 then divide 25 by 5 a = 5