30=80-x

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Solution for 30=80-x equation: 



30=80-x

We move all terms to the left:

30-(80-x)=0

We add all the numbers together, and all the variables

-(-1x+80)+30=0

We get rid of parentheses

1x-80+30=0

We add all the numbers together, and all the variables

x-50=0

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

x=50

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