Which situation cannot be represented by this equation? 3x – 5 = 25 clay has 25 marbles to trade for some of mark's baseball cards. if clay makes the trade today, mark will give him a discount of 5 marbles. if each card is worth 3 marbles, how many baseball cards, x, will clay get? clay has 25 marbles to trade for some of mark's baseball cards. if clay makes the trade today, mark will give him a discount of 3 marbles. if each card is worth 5 marbles, how many baseball cards, x, will clay get? clay has 25 marbles to trade for some of mark's baseball cards. if clay makes a trade today, mark will give him a discount of 5 marbles. if clay receives 3 baseball cards, how many marbles, x, was each card worth?