Question

Can u pls help me with this question ​

Answer 1

x + 7.

Explanation:

The answer is X + 7 because you know, 8x + 13 and if 7x - 9 we're solded. We remove 7x at 8x so at least we have only one x and we remove 9 than 16 so we have 7. That's why the reply is x + 7. Sorry if I wasn't clear, I am not really good at english.

Answer 2

add the two equations together
8x+16 + 7x-9
collect like terms
=15x + 7