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2x+12.3=x+17.1
We move all terms to the left:
2x+12.3-(x+17.1)=0
We get rid of parentheses
2x-x-17.1+12.3=0
We add all the numbers together, and all the variables
x-4.8=0
We move all terms containing x to the left, all other terms to the right
x=4.8
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