Find the first forth and tenth terms of the arithmetic sequence described by the given rulea(n)=-6+(n-1)(1/5)

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.