x+1=21-x

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Solution for x+1=21-x equation: 



x+1=21-x

We move all terms to the left:

x+1-(21-x)=0

We add all the numbers together, and all the variables

x-(-1x+21)+1=0

We get rid of parentheses

x+1x-21+1=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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