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4.7x+3.8=13.9
We move all terms to the left:
4.7x+3.8-(13.9)=0
We add all the numbers together, and all the variables
4.7x-10.1=0
We move all terms containing x to the left, all other terms to the right
4.7x=10.1
x=10.1/4.7
x=2+0.7/4.7
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