Elementary Math Word Problem

Question

David & Julie had an equal number of marbles. After Julie gave 50 marbles to David, he had 5 times as many marbles as her. What is the total number of marbles they had?

Answer 1

both start out with "m" marbles

Julie gives and David gets 50 marbles

m - 50, and m + 50

David equals 5 times Julie

m + 50 = 5(m - 50)

Can you solve for m and answer?