12a- 6a + a = 7a
Since they all have the same variable, you can simply add and subtract
12-6 = 6
6+1 = 7
21a - 6a
18
12a2b + 6a = 6a(2ab + 1)
2a² + 6a
12a^2
6(a+b)
4a+8a = 12a 12a divided by 2 = 6a
a = 1/2
It is 20a - 5b - 9.
There are 3 terms in the given expression of 6a+9b+15
to solve this expression: 10a-4(a+2) -> 10a-4(a)-4(2) -> 10a-4a-8 -> 6a-8
12a