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4x-8.1=15.8
We move all terms to the left:
4x-8.1-(15.8)=0
We add all the numbers together, and all the variables
4x-23.9=0
We move all terms containing x to the left, all other terms to the right
4x=23.9
x=23.9/4
x=5+2.0526315789474/2.1052631578947
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