Payton brought packages of black t-shirts and packages of white t-shirts. Each package of black t-shirts contains 3 shirts. Each package of white t-shirts contains 4 shirts. Payton bought b packages of black t-shirts and 5 packages of white t-shirts for total of 38 t-shirts.
Which equation could Payton solve to determine the number of packages of black t-shirts, b, he brought?
