100-x=80-0.5x

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Solution for 100-x=80-0.5x equation: 



100-x=80-0.5x

We move all terms to the left:

100-x-(80-0.5x)=0

We add all the numbers together, and all the variables

-x-(-0.5x+80)+100=0

We add all the numbers together, and all the variables

-1x-(-0.5x+80)+100=0

We get rid of parentheses

-1x+0.5x-80+100=0

We add all the numbers together, and all the variables

-0.5x+20=0

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

-0.5x=-20

x=-20/-0.5

x=+40

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