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13.7=x2.1
We move all terms to the left:
13.7-(x2.1)=0
We add all the numbers together, and all the variables
-(+x2.1)+13.7=0
We get rid of parentheses
-x2.1+13.7=0
We move all terms containing x to the left, all other terms to the right
-x2.1=-13.7
x=-13.7/1
x=-13.7
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