pouvez m 'aider à faire ces exercices comme l'exemple:

Exemple:

5x - 4 = 3x + 2

donc 5x - 4 - (3x +2) = 0

donc 5x - 4- 3x - 2 =0

donc 2x - 6 = 0

donc 2x = 6

donc 2 * x = 6

donc x = 6/2

donc x = 3


exercice 42:
a) 2x - 3 = 4 + x
b) y + 4 = -4 - 3y

exercice 43:
a) 7x - 6 = 4 - 3x
b) 12 - a = 18 - 3a

exercice 44:
a) -t - 4 = 8 + 7t
b) 13x + 11 = 8x + 28

exercice 45:
a) 5x = 0
b) 7y + 22 = 14 - 4y
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