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2m-1m-1m+4m+1m=20
We move all terms to the left:
2m-1m-1m+4m+1m-(20)=0
We add all the numbers together, and all the variables
5m-20=0
We move all terms containing m to the left, all other terms to the right
5m=20
m=20/5
m=4
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