Distribute.
[tex]5x \times 6x - 8 = 2x + 12[/tex]
Add like terms.
[tex]11x - 8 = 2x + 12[/tex]
Get variables on one side.
[tex]9x - 8 = 12[/tex]
Get whole numbers on the opposite.
[tex]9x = 20[/tex]
Divide.
[tex]x = \frac{20}{9} [/tex]
That's the answer.
Hope this helped!
:)