3x-0.2=3.9

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Solution for 3x-0.2=3.9 equation: 



3x-0.2=3.9

We move all terms to the left:

3x-0.2-(3.9)=0

We add all the numbers together, and all the variables

3x-4.1=0

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

3x=4.1

x=4.1/3

x=1+1/2.7272727272727

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