x=80-x

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Solution for x=80-x equation: 



x=80-x

We move all terms to the left:

x-(80-x)=0

We add all the numbers together, and all the variables

x-(-1x+80)=0

We get rid of parentheses

x+1x-80=0

We add all the numbers together, and all the variables

2x-80=0

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

2x=80

x=80/2

x=40

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