[tex]3x+12=2(8+4x)[/tex] distribute
[tex]3x+12=16+8x\\[/tex] collect like-terms
[tex]3x-8x=16-12\\-5x=4\\x=-\frac{4}{5}=-0.8[/tex]
x = - 4/5
3x + 12 = 2(8 + 4x)
3x + 12 = 16 + 8x
12 - 16 = 8x - 3x
- 4 = 5x
