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5.1x-16.9=23.9
We move all terms to the left:
5.1x-16.9-(23.9)=0
We add all the numbers together, and all the variables
5.1x-40.8=0
We move all terms containing x to the left, all other terms to the right
5.1x=40.8
x=40.8/5.1
x=8
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