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7m+3-4m=-
We move all terms to the left:
7m+3-4m-(-)=0
We add all the numbers together, and all the variables
7m-4m+3-0=0
We add all the numbers together, and all the variables
3m+3=0
We move all terms containing m to the left, all other terms to the right
3m=-3
m=-3/3
m=-1
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