Solve the Equation: Finding the Missing Number in ?-0=705

To solve this problem, we'll follow these steps:

• Step 1: Understand that the problem involves simple subtraction of zero.
• Step 2: Apply the property of zero in subtraction, $a - 0 = a$.
• Step 3: Recognize that the given equation is $? - 0 = 705$.

Now, let's work through each step:
Step 1: The equation $? - 0 = 705$ is given.
Step 2: According to the property of zero: $a - 0 = a$, thus, $? = 705$.
Step 3: Therefore, the unknown number or value of $?$ is simply 705, since subtracting zero doesn’t change the number.

Hence, the solution to the problem is $705$.