Answer: The answer is (9, -9)
Solving it 5x=15
15/5 X=3
You get a common denomiator so which is 18. So mulitply 8/9 by 2 which is 16/18 and multiply 5/6 by 3 which is 15/18 and add 16/18 and 15/18 together and you get.....35/18 and you divide. 35 divided by 18 is 1 13/18
