12x-5,14=59,66

Assuming the comma is a decimal separator:

Equation: 12x - 5.14 = 59.66

Steps:

1. 12x = 59.66 + 5.14 = 64.80
2. x = 64.80 / 12 = 5.40

Answer: x = 5.40 (which is 27/5 in fraction form). If you intended something else (e.g., comma as a thousand separator), let me know.