you have 49 hamburgers in total, 24 on the grill and the rest are in the fridge and represented by the variable H.
we know that the 24 hamburgers on the grill, when added to the number of hamburgers we have in the fridge, have to equal the total number of hamburgers, 49.
so 24+h=49, or 49=24+h depending on how you're supposed to write your answer