How to solve 6×+8 = 12x-4

Write a corresponding real world problem to represent 2x - 125=400

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?

For the inequality |c| < |d| to be true, which of the following must be true?