x-9=20-x

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Solution for x-9=20-x equation: 



x-9=20-x

We move all terms to the left:

x-9-(20-x)=0

We add all the numbers together, and all the variables

x-(-1x+20)-9=0

We get rid of parentheses

x+1x-20-9=0

We add all the numbers together, and all the variables

2x-29=0

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

2x=29

x=29/2

x=14+1/2

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