8/12 - 3/12 = 5/12
m = 5/12
explanation: to get the two fractions (2/3 and 1/4) to have the same denominator, we multiply 2/3 by 4, both the top and bottom, and we also multiply 1/4 by three, both sides as well.
this results in 8/12 and 3/12, and when we subtract these two fractions, it gives us the fraction that the variable m represents
hope this helps.
