9,5x - (3,2x + 1,8x) + 3,75 = 6,9

Simplify the terms within the parentheses:

9,5x - (5x) + 3,75 = 6,9

Combine like terms:

9,5x - 5x + 3,75 = 6,9

Subtract 5x from 9,5x:

4,5x + 3,75 = 6,9

Subtract 3,75 from both sides:

4,5x = 3,15

Divide by 4,5 on both sides:

x = 0,7

So, the solution to the equation is x = 0,7.