X+8x+11=146

To solve the equation \( x + 8x + 11 = 146 \), first combine like terms on the left side:

\[ 9x + 11 = 146 \]

Next, subtract 11 from both sides:

\[ 9x = 146 - 11 \] \[ 9x = 135 \]

Now, divide both sides by 9 to solve for \( x \):

\[ x = \frac{135}{9} \] \[ x = 15 \]

Thus, the solution is:

\[ \boxed{15} \]