4a + 3a = (4 + 3)a = 7a
-7a + 3a = -4a
2a + 9 = 4a - 19 9 + 19 = 4a - 2a 28 = 2a a = 14
2a*3 = 8+4a 6a = 8+4a 6a-4a = 8 2a = 8 a = 4
14a - 4a + 5a - 3a = 12a
You don't have a number alone. Also I'll make the assumption that it is 19a+2a-4a+3a Without a number alone, it can't really be solved, unless a=0 19a+2a-4a+3a can be simplified however to 20a
A, 2A, 3A, 4A, 5A, and so on.
The value of a is -7
4a + 3a = (4 + 3)a = 7a
10a + 3a - 4a = 9a
"a" plus "3a" is equal to 4a. (3a+a=4a). You already have 3 "a's" and then you add another "a."
4a
-7a + 3a = -4a
Take your pick: a, 2a, 3a, 4a .... etc
2a + 9 = 4a - 19 9 + 19 = 4a - 2a 28 = 2a a = 14
4a+3a-4 = 10 4a+3a = 10+4 7a = 14 a = 2
That factors to (2a - 7)(2a + 9)