86=x-3.9

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Solution for 86=x-3.9 equation: 



86=x-3.9

We move all terms to the left:

86-(x-3.9)=0

We get rid of parentheses

-x+3.9+86=0

We add all the numbers together, and all the variables

-1x+89.9=0

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

-x=-89.9

x=-89.9/-1

x=89+0.90000000000001/1

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