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Alors, si j'ai bien compris.
a = 10
b = 13
-b = -13
a - b = 10 - 13 = -3
a + (-b) = 10 + (-13) = -3
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a = 5
b = -3
-b = - (-3) = 3
a - b = 5 - (-3) = 8
a + (-b) = 5 + 3 = 8
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a = -8
b = 2
-b = -2
a - b = -8 - 2 = -10
a + (-b) = -8 + (-2) = -10
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a = -11
b = -4
-b = - (-4) = 4
a - b = -11 - (-4) = -7
a + (-b) = -11 + 4 = 7