Explications étape par étape:
[tex]a.8x + 3 = 0 \\ 8x = - 3 \\ x = \frac{ - 3}{8} [/tex]
[tex]b.2x - 9 = 0 \\ 2x = 9 \\ x = \frac{9}{2} [/tex]
[tex]c.49 - 7x = 0 \\ - 7x = - 49 \\ \\ x = \frac{ - 7}{ - 49} = \frac{7}{49} [/tex]
[tex]d. - 6x - 5 = 0 \\ - 6x = 5 \\ x = \frac{5}{ - 6} [/tex]
[tex]e.5x + 12 = 3 \\ 5x = - 12 + 3 \\ 5x = - 9 \\ x = \frac{ - 9}{5} [/tex]
[tex]f.10x + 1 = - 1 \\ 10x = - 1 - 1 \\ 10x = - 2 \\ x = \frac{ - 2}{10} [/tex]
[tex]g.9x - 2 = 6 \\ 9x = 2 + 6 \\ 9x = 8 \\ x = \frac{8}{9} [/tex]
[tex]h.20 - 4x = - 4 \\ - 4x = - 4 - 20 \\ - 4x = - 24 \\ x = \frac{ - 24}{ - 4} \\ \\ x = \frac{24}{4} \\ x = 6[/tex]
