100-x=100-2x

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Solution for 100-x=100-2x equation: 



100-x=100-2x

We move all terms to the left:

100-x-(100-2x)=0

We add all the numbers together, and all the variables

-x-(-2x+100)+100=0

We add all the numbers together, and all the variables

-1x-(-2x+100)+100=0

We get rid of parentheses

-1x+2x-100+100=0

We add all the numbers together, and all the variables

x=0

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