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3.5x-12.4=12.8
We move all terms to the left:
3.5x-12.4-(12.8)=0
We add all the numbers together, and all the variables
3.5x-25.2=0
We move all terms containing x to the left, all other terms to the right
3.5x=25.2
x=25.2/3.5
x=7+0.7/3.5
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