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3.93x+15.72=31.44
We move all terms to the left:
3.93x+15.72-(31.44)=0
We add all the numbers together, and all the variables
3.93x-15.72=0
We move all terms containing x to the left, all other terms to the right
3.93x=15.72
x=15.72/3.93
x=4
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