The zeros are 1/2, 1/3, and -5
The answer is -3/2. Solve for x by simplifying both sides of the equation.
The card one is 4/52 for kings but then 20/51 because you take a card the first time and you do not replace it.
The marbles is 1/4 chance. 10 green 10 not. For ball 1 it’s a 1/2 (50:50) chance of picking green. that’s reduce because you want to pick 2 green balls (25% chance)