Definition: You are provided with an arithmetic question. Your task is to compute the solution using the given arithmetic operations. The only arithmetic operators needed to answer the questions are'+'(addition) and'-'(subtraction). The answer should be correct to one decimal place.
Input: Sara has 792 black and 122 red marbles. Fred took 233 of Sara'sblack marbles. How many black marbles does Sara now have?

559.0