x+3.9=12.2

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Solution for x+3.9=12.2 equation: 



x+3.9=12.2

We move all terms to the left:

x+3.9-(12.2)=0

We add all the numbers together, and all the variables

x-8.3=0

We move all terms containing x to the left, all other terms to the right

x=8.3

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