(-4)-(-15)

Let's calculate: (-4) -(-15)
ⓘ Subtract a negative number by adding its opposite: the two minus signs become a plus: -(-15) = 15
(-4) + 15
ⓘ Start from -4 and move forward 15 on the number line, going past zero: (-4) + 15 = 11
▶Result:   11

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