100-x=80+x

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Solution for 100-x=80+x equation: 



100-x=80+x

We move all terms to the left:

100-x-(80+x)=0

We add all the numbers together, and all the variables

-x-(x+80)+100=0

We add all the numbers together, and all the variables

-1x-(x+80)+100=0

We get rid of parentheses

-1x-x-80+100=0

We add all the numbers together, and all the variables

-2x+20=0

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

-2x=-20

x=-20/-2

x=+10

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