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3.9=10x+4.1
We move all terms to the left:
3.9-(10x+4.1)=0
We get rid of parentheses
-10x-4.1+3.9=0
We add all the numbers together, and all the variables
-10x-0.2=0
We move all terms containing x to the left, all other terms to the right
-10x=0.2
x=0.2/-10
x=-0.2/10
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