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Berlaku :

1. + = +

2. − = + −

3. − + − = − +
4. − − = +

Contoh :
1. 4 + 3 = 7

2. 6 – 4 = 6 + (-4) = 2

3. -3 + (-2) = - (3+2) = - 5
4. 9 – (-5) = 9 + 5 = 14