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39.9x=2.1
We move all terms to the left:
39.9x-(2.1)=0
We add all the numbers together, and all the variables
39.9x-2.1=0
We move all terms containing x to the left, all other terms to the right
39.9x=2.1
x=2.1/39.9
x=2.1/39.9
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