x=20.4-x

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Solution for x=20.4-x equation: 



x=20.4-x

We move all terms to the left:

x-(20.4-x)=0

We add all the numbers together, and all the variables

x-(-1x+20.4)=0

We get rid of parentheses

x+1x-20.4=0

We add all the numbers together, and all the variables

2x-20.4=0

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

2x=20.4

x=20.4/2

x=10+0.4/2

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