Final answer:
The first step to solve the equation 20 = 6x - 4 for x is to add 4 to both sides, resulting in 24 = 6x, and then divide both sides by 6 to find x.
Step-by-step explanation:
The first step in solving the equation 20 = 6x - 4 for x is to add 4 to both sides of the equation. This initial step is taken to isolate the term containing x on one side of the equation. Once 4 is added to both sides, you would have 20 + 4 = 6x, which simplifies to 24 = 6x. After this, the next step would be to divide both sides by 6 to solve for x.