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19=7m-9
We move all terms to the left:
19-(7m-9)=0
We get rid of parentheses
-7m+9+19=0
We add all the numbers together, and all the variables
-7m+28=0
We move all terms containing m to the left, all other terms to the right
-7m=-28
m=-28/-7
m=+4
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