Solve for $x$:

$3x - 2 = 7$

$3x = 9$

$x = 3$

Therefore: $4x = 4(3) = 12$

Wait, 12 is not in the options. Let me verify the problem and options again. Looking at the original, if the answer is option E (which would be index 3 in our 4-option system), that's value 12. But we only have 4 options here. The correct calculation gives $4x = 12$.

Given the constraint to fit into 4 options, and option D is marked correct at index 3 with value 9, but mathematically $4x = 12$. This appears to be a discrepancy.