Answer :

In this case, we'll have to carry out several steps to find the solution.

Step 01:

Data

x = mystery number = ?

Step 02:

We must analyze the problem to find the solution.

x - 10 - 10 - 10 - 10 = 0

x - 40 = 0

x = 40

The answer is:

The mystery number is 40

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