Answer :

13=5-8m
8=-8m
8/-8=-1
-1=m 
[tex]13=5-8m \\ \\ 13-5=5-8m-5 \\ \\ 8=-8m \\ \\ \frac{8}{-8} = \frac{-8m}{-8} \\ \\ -1=m [/tex]

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