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3.78x+18.9=37.8
We move all terms to the left:
3.78x+18.9-(37.8)=0
We add all the numbers together, and all the variables
3.78x-18.9=0
We move all terms containing x to the left, all other terms to the right
3.78x=18.9
x=18.9/3.78
x=5
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