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19-13m=9-12m
We move all terms to the left:
19-13m-(9-12m)=0
We add all the numbers together, and all the variables
-13m-(-12m+9)+19=0
We get rid of parentheses
-13m+12m-9+19=0
We add all the numbers together, and all the variables
-1m+10=0
We move all terms containing m to the left, all other terms to the right
-m=-10
m=-10/-1
m=+10
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