Question

How do you combine like terms in `v+ 6v - 2v`?

Answer 1

You always need to use PEMDAS. In this case there is only addition and subtraction. So you can choose either one to do first.
Answer: 7v-2v= 5v
Answer: v+4v= 5v
Same answer.

Explanation:

P: parenthesis
E: Exponents
M: Multiplication
D: Division
A: Addition
S: Subtraction