3.1=3.9-0.2x

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Solution for 3.1=3.9-0.2x equation: 



3.1=3.9-0.2x

We move all terms to the left:

3.1-(3.9-0.2x)=0

We add all the numbers together, and all the variables

-(-0.2x+3.9)+3.1=0

We get rid of parentheses

0.2x-3.9+3.1=0

We add all the numbers together, and all the variables

0.2x-0.8=0

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

0.2x=0.8

x=0.8/0.2

x=4

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