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1) 3(4x + 1) - 9 = 7x-4(3-2x)
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MAUDMARINE

Bonjour,

3(4x + 1) - 9 = 7x-4(3-2x)

12x + 3 - 9 = 7x - 12 + 8x

12x - 7x - 8x = - 12 - 3 + 9

- 3x = - 6

x = 6/3

x = 2.