(-1)-(-1)

Let's calculate: (-1) -(-1)
ⓘ Subtract a negative number by adding its opposite: the two minus signs become a plus: -(-1) = 1
(-1) + 1
ⓘ Start from -1 and move forward 1 on the number line, up to zero: (-1) + 1 = 0
▶Result:   0

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