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3.5x+452.8=681.6
We move all terms to the left:
3.5x+452.8-(681.6)=0
We add all the numbers together, and all the variables
3.5x-228.8=0
We move all terms containing x to the left, all other terms to the right
3.5x=228.8
x=228.8/3.5
x=65+1/2.6923076923077
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