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3.7x-12.8=5.7
We move all terms to the left:
3.7x-12.8-(5.7)=0
We add all the numbers together, and all the variables
3.7x-18.5=0
We move all terms containing x to the left, all other terms to the right
3.7x=18.5
x=18.5/3.7
x=5
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