Always do multiplication first.
-4(-3d-3) --> 12d +12
Now combine like terms:
Left Side: -9d+12d+12 --> 3d +12
Right Side: 12d+6
Bring the two sides together
3d+12 [tex]\geq[/tex] 12d+6
Combine like terms even more
6[tex]\geq[/tex]9d
9d[tex]\leq[/tex]6
d[tex]\leq[/tex][tex]\frac{2}{3}[/tex]
