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x/12.8=3.1
We move all terms to the left:
x/12.8-(3.1)=0
We add all the numbers together, and all the variables
x/12.8-3.1=0
We multiply all the terms by the denominator
x-(3.1)*12.8=0
We add all the numbers together, and all the variables
x-39.68=0
We move all terms containing x to the left, all other terms to the right
x=39.68
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