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2x+20.9=x+2.1
We move all terms to the left:
2x+20.9-(x+2.1)=0
We get rid of parentheses
2x-x-2.1+20.9=0
We add all the numbers together, and all the variables
x+18.8=0
We move all terms containing x to the left, all other terms to the right
x=-18.8
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