a
[tex] \frac{6x + 4x - 3x}{12} = 14 \\ 7x = 14 \times 12 \\ x = 2 \times 12 \\ x = 24[/tex]
b
[tex] \frac{4x + 2x + 3x}{4} = 18 \\ 9x = 18 \times 4 \\ x = 8[/tex]
c
[tex]3x + 2x = 14 + 6x \\ x = 14[/tex]
d
[tex]9x - 6 - 24 + 6x = 24x - 28x + 8 \\ 19x = 38 \\ x = 2[/tex]
