Solve for m

To solve the equation \( 5m - 2m + 6m = -81 \), first combine the like terms on the left side:

\[
(5m - 2m + 6m) = (5 - 2 + 6)m = 9m
\]

Next, the equation simplifies to:

\[
9m = -81
\]

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

\[
m = \frac{-81}{9} = -9
\]

Thus, the solution is:

\[
\boxed{-9}
\]