0.4x=3.99-x

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Solution for 0.4x=3.99-x equation: 



0.4x=3.99-x

We move all terms to the left:

0.4x-(3.99-x)=0

We add all the numbers together, and all the variables

0.4x-(-1x+3.99)=0

We get rid of parentheses

0.4x+1x-3.99=0

We add all the numbers together, and all the variables

1.4x-3.99=0

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

1.4x=3.99

x=3.99/1.4

x=2+1/1.1764705882353

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