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4m-2m-6.5=2.1
We move all terms to the left:
4m-2m-6.5-(2.1)=0
We add all the numbers together, and all the variables
2m-8.6=0
We move all terms containing m to the left, all other terms to the right
2m=8.6
m=8.6/2
m=4+0.6/2
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