The integer number that represents the changing in his account balance from beginning to end is of -20.
Non-decimal numbers, either positive or negative numbers, also zero, belong to the set, which can be represented by:
Z = {..., -3, -2, -1, 0, 1, 2, 3, ...}
A change can be represented by the final value subtracted by the initial value. For this problem, we have that:
Hence the change in the balance is:
0 - 20 = -20.
And the integer is -20.
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