Bonjour j’aurrais besoin d’aide sur un devoir en math pour demain / merci …!

Exercice 12 :

Réduire chaque expression.

a) 7x + 3 + 5x + 6

b) -4y + 9 - 5y - 7

c) 82-9 – 12a + 3

d) 15b2 + 3b-9b2 – 5
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