Here we see two types of terms: with m and with n. Let's group like terms using the commutative law:
2m+5n+6m+8n = (2m+6m)+(5n+8n).
Now use the distributive law:
(2m+6m)+(5n+8n) = (2+6)*m + (5+8)*n = 8*m + 13*n.
This is the answer.
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