34 x + 8 = 71 x - 49 how to solve this equation

Solve for x i'll try to attach the files bc it's not letting me for some reason

Can someone me and plz do the problem

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%