ANSWER
[tex]m + 23[/tex]
EXPLANATION
The given expression is
[tex]m - 13 + 42 - 6[/tex]
We regroup the numerical parts to get;
[tex]m + 42 - 6 - 13[/tex]
Now let us simplify the negative numbers.
[tex]m + 42 - 19[/tex]
We now subtract 19 from 42 to get;
[tex]m + 23[/tex]
We can't simplify further
Hence the simplest form is:
[tex]m + 23[/tex]
