(9,1-х)-2,8=2,9

To solve the equation \( (9,1 - x) - 2.8 = 2.9 \), follow these steps:

1. Start with the equation: \[ 9.1 - x - 2.8 = 2.9 \]

2. Combine like terms on the left-hand side: \[ 9.1 - 2.8 - x = 2.9 \] \[ 6.3 - x = 2.9 \]

3. Move \( x \) to the right-hand side: \[ 6.3 - 2.9 = x \] \[ 3.4 = x \]

So, the solution is: \[ x = 3.4 \]