What’s the answer to this?! ;)))

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

3x + 4y = 5 x- 3y = -7 solve by substitution

2x minus y equals 6, x plus y equals negative 3