Floyd is an aspiring music artist. He has a record contract that pays him a base rate of \$200$200dollar sign, 200 a month and an additional \$12$12dollar sign, 12 for each album that he sells. Last month he earned a total of \$644$644dollar sign, 644. Write an equation to determine the number of albums (a)(a)left parenthesis, a, right parenthesis Floyd sold last month.