For any number subtracted from zero, answer is always that number but opposite in sign.
For example, 0 - 7 = -7
or 0 - a negative 7, that is , 0- (-7), = +7
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Any number multiplied by zero is zero.
Any number plus zero is that number.
Zero divided by any number is always zero and a number cannot be divided by zero.
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If you add zero to any number, the sum is the same number you started with.