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3.1m-21=5.1
We move all terms to the left:
3.1m-21-(5.1)=0
We add all the numbers together, and all the variables
3.1m-26.1=0
We move all terms containing m to the left, all other terms to the right
3.1m=26.1
m=26.1/3.1
m=8+1/2.3846153846154
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