Imagine you have 22 small boxes, and you want to fill them all up. In this case, we are using the letter 'h' to represent how many items we need to put in each box. So, the equation you gave, 0 = 22*h, tells us that when we have zero items, we need to find out how many items we should put in each of the 22 boxes. Since we have no items to distribute, h must equal zero because zero times anything is always zero.
So, in short, this equation is saying that if we have 22 boxes and we have zero items to put in each box, then the value of 'h' (number of items in each box) must be zero for the equation to be true.