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2112212m+56472-4578m=21
We move all terms to the left:
2112212m+56472-4578m-(21)=0
We add all the numbers together, and all the variables
2107634m+56451=0
We move all terms containing m to the left, all other terms to the right
2107634m=-56451
m=-56451/2107634
m=-56451/2107634
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