Let's break down the equation:

(4,248 - 1,56x) + 3.8 = 55

First, let's simplify the expression within the parentheses:

4,248 - 1,56x = 2.688

Now, we can rewrite the equation:

2.688 + 3.8 = 55

Adding the two numbers together:

6.488 = 55

Since 6.488 is not equal to 55, there seems to be an error in the given equation. Please double-check the equation and provide the correct values.