6,5(6,9+1,2)+(-0,9)

To solve the expression \( 6.5(6.9 + 1.2) + (-0.9) \), we can follow these steps:

1. First, calculate the sum inside the parentheses: \[ 6.9 + 1.2 = 8.1 \]

2. Now, substitute this back into the expression: \[ 6.5 \times 8.1 + (-0.9) \]

3. Calculate \( 6.5 \times 8.1 \): \[ 6.5 \times 8.1 = 52.65 \]

4. Now, add \(-0.9\): \[ 52.65 - 0.9 = 51.75 \]

Thus, the final result is: \[ \boxed{51.75} \]