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Sagot :

VINS

[tex]bonjour\\\\3 x - 1 = 20\\3 x = 20+ 1 \\3 x = 21\\x = 21/3 = 7 \\\\\\2 x + 1 = x + 14 \\2 x - x = 14 - 1 \\x = 13 \\[/tex]

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