[tex]bonjour\\\\\\2.5 x + 6 = 5 x - 2.1\\2.5 x - 5 x = - 2.1 - 6\\- 2.5 x = - 8.1\\x = 3.24\\\\\\5.4 - 2 y = 1\\- 2 y = 1 - 5.4\\- 2 y = - 4.4\\y = 2.2\\\\\\1.4 - 0.5 x = 0.4 + 5.5 x\\- 0.5 x - 5.5 x = 0.4 - 1.4\\- 6 x = - 1\\x = 1/6 = faux \\ \\\\\\3 t - 5 = - 2 t + 1.5\\3 t + 2 t = 1.5 + 5\\5 t = 6.5\\t = 1.3 \\\\\\[/tex]
