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 calculate terms in parentheses: -((-1X+80)), so:

(-1X+80)

We get rid of parentheses

-1X+80

Back to the equation:

-(-1X+80)



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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