10a + 3a - 4a = 9a
If you mean: 4a +29 -3a -a +3a then it simplifies to 29 +3a
The GCF is 2a.
4a + 3a = (4 + 3)a = 7a
Add them together: 3a+4a-a = 6a
4a+3a-4 = 10 4a+3a = 10+4 7a = 14 a = 2
"a" plus "3a" is equal to 4a. (3a+a=4a). You already have 3 "a's" and then you add another "a."
If all the variables are the same, you just add (algebraically add) the numbers. For example: 3a + 4a = 7a 2a - 10a = -8a
12a + a - 3a = 10a
It is: 3a+7a = 10a simplified
2a
-7a + 3a = -4a