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2.1x+3=3.1
We move all terms to the left:
2.1x+3-(3.1)=0
We add all the numbers together, and all the variables
2.1x-0.1=0
We move all terms containing x to the left, all other terms to the right
2.1x=0.1
x=0.1/2.1
x=0.1/2.1
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