SVP ! urgent !! sur les calculs laterales : Reduire Chaque expression ex 46 p.71: Ex:46 p.71 :.
a) 7x +3+ 5x + 6
b) -4y+9 - 5y - 7
c) 8a -9 - 12a + 3
d) 15b* + 3b - 9b*- 5
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