Résoudre ces équations :

--> 5x + 89 - 57 + 4x = 58 - 69 + 2x

--> 825 - 877 + 6x + 8 = 225 - 85 + 6x

--> 14 + 48 + 6x = 17x + 5 - 9x

--> 54 - 99 - 6 + 4x = 548 + 65 + 8x
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