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

1 Answer
Sep 2, 2017

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

Explanation:

Combine like terms first - as with as and bs with other bs

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