Solve 3(2x - 4) = 18.

Use the distributive property:
6x - 12 = 18

Add 12 to both sides:
6x = 30

Divide both sides by 6:
x = 5

Check by substituting x = 5 into the original equation:
3(2(5) - 4) = 3(10 - 4) = 18

Therefore, x = 5.