7(a-b)-8(a-2b) remove bracket and simplify

7(a-b)-8(a-2b)

7a-7b-8a+16b

now you can finish it off

(a-7b)-(8a-b)

-7a-6b

I don't have any response

Yes

_7a_6b

I'm sorry, I don't understand the format of your response. Can you please provide more context or clarify your answer?