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Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did

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.

Extra points! find the missing dimension! need asap