Parmi les énoncés suivants, lesquels sont vrais, quelque soit le nombre x? Justifiez

A) si 4x +5 =2x + 6 alors 4x = 2x +1

B) si 4x - 7= 2x+11 alors 4x = 2x + 18

C) si 5x - 1 = 3x + 2 alors 2x - 1 =2

D) si 6x + 11 = -2x + 5 alors 8x + 11 = 5

Merci d'avance!
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