3•x+8•x=81-34:2+2

To solve the equation \(3x + 8x = 81 - \frac{34}{2} + 2\), we can simplify both sides step by step.

1. Combine like terms on the left side:

   \[ 3x + 8x = 11x \]

2. Simplify the right side:

   \[ 81 - \frac{34}{2} + 2 \] First, divide \(34\) by \(2\):

   \[ \frac{34}{2} = 17 \]

   Now plug this back into the right side:

   \[ 81 - 17 + 2 = 81 - 17 = 64 \quad \text{and then} \quad 64 + 2 = 66 \]

3. Set the simplified equation:

   \[ 11x = 66 \]

4. Solve for \(x\):

   \[ x = \frac{66}{11} = 6 \]

Thus, the solution is:

\[ \boxed{6} \]