[tex]a. \: x + 4 = 6 \\ x = 2 \\ \\ b. \: x - 7 = 0 \\ x = 7 \\ \\ c. \: 3x = 6 \\ x = 2 \\ \\ [/tex]
[tex]d. \: - 6x = 3 \\ x = - 0.5 \\ \\ e. \: \frac{7}{6} = \frac{2}{x} \\ 7x = 12 \\ x = \frac{7}{12} \\ \\[/tex]
[tex]f. \: 7x + 3 = - 2x - 4 \\ 9x = - 7 \\ x = \frac{ - 7}{9} \\ [/tex]