f)
[tex]10 \times x = 4 \times x - 6[/tex]
[tex]10x = 4x - 6[/tex]
[tex]10x - 4x = - 6[/tex]
[tex]6x = - 6[/tex]
[tex]x = - 1[/tex]
g)
[tex]3 \times x = 9 - 6 \times x[/tex]
[tex]3x = 9 - 6x[/tex]
[tex]3x + 6x = 9[/tex]
[tex]9x = 9[/tex]
[tex]x = 1[/tex]