bonjour
[tex]15 x - 3.5 = - 3 x + 2\\15 x + 3 x = 2 + 3.5\\18 x = 5.5\\x = 55/180 = 11/ 36 \\\\4.5 x - 4.8 = 2.5 x + 7 \\4.5 x - 2.5 x = 7 + 4.8 \\2 x = 11.8 \\x = 11.8 / 2 = 5.9\\\\- 7 x+ 2.5 = - 6.5 x - 0.5\\- 7 x + 6 .5 x = - 0.5 - 2.5 \\- 0.5 x = - 3 \\x = 6\\\\7 x + 9 = - 1.5 x- 2. 3\\7 x + 1.5 x = - 2.3 - 9 \\8.5 x = - 11.3 \\x = - 113 / 85 \\\\[/tex]
