X-(80-x)=80

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Solution for X-(80-x)=80 equation: 



X-(80-X)=80

We move all terms to the left:

X-(80-X)-(80)=0

We add all the numbers together, and all the variables

X-(-1X+80)-80=0

We get rid of parentheses

X+1X-80-80=0

We add all the numbers together, and all the variables

2X-160=0

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

2X=160

X=160/2

X=80

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