Bonjour qui pourrait m'aider pour un exercice de maths

Calculer les expression suivantes :(avec les étapes)
A= 19 + (8 - 25)
B= (-15 + 6) - (23 - 18)
C= (14 - 5) +4-(-9 + 7)
D= -12 + (5 + 8) - (-2 -10)

Merci d'avance
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