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2.1m-2.1=4.2
We move all terms to the left:
2.1m-2.1-(4.2)=0
We add all the numbers together, and all the variables
2.1m-6.3=0
We move all terms containing m to the left, all other terms to the right
2.1m=6.3
m=6.3/2.1
m=3+-8.8817841970013E-16/2.1
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