3.9-x=4

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Solution for 3.9-x=4 equation: 



3.9-x=4

We move all terms to the left:

3.9-x-(4)=0

We add all the numbers together, and all the variables

-1x-0.1=0

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

-x=0.1

x=0.1/-1

x=-0.1/1

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