Without solving them, say whether the equations below have a positive solution, a negative solution, a zero solution, or no solution. Give a reason for your answer.
Example: 2x+4=5. We are adding a number, 2x, to 4 to get 5. Thus, 2x must be positive. Since 2 is positive, in order for the product 2x to be positive, then x must also be positive.
(a) 4−2x=5