Question

How do you combine `(k+4) + (2-3k) + (6k-1)`?

Answer 1

Group you "kangaroos" (the `k`'s) together and the simple numbers together and add the two collections separately.

`(k+4) + (2-3k) +(6k-1)`

`= (k-3k+6k) + (4+2-1)`

`= 4k +5`