Ignore how blurry the picture is

The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant.given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion

Ithink i know it but i want to be sure so can you me out ?