x+20=100-x

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Solution for x+20=100-x equation: 



x+20=100-x

We move all terms to the left:

x+20-(100-x)=0

We add all the numbers together, and all the variables

x-(-1x+100)+20=0

We get rid of parentheses

x+1x-100+20=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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