Question

How do you combine `\frac { 2} { 3} a + \frac { 5} { 9} - 21- \frac { 4} { 5} a - \frac { 7} { 9} b`?

Answer 1

`-2/15a-7/9b-184/9`

Explanation:

Combine like terms first - `a`s with `a`s and `b`s with other `b`s

`2/3a-4/5a -7/9b +5/9 -21`
`2/3-4/5=10/15-12/15 = -2/15a`
`-7/9b` is already simplified
`5/9-21/1 = 5/9-189/9=-184/9`

so simplified terms is

`-2/15a-7/9b-184/9`