2x-(x+1)=21

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Solution for 2x-(x+1)=21 equation: 



2x-(x+1)=21

We move all terms to the left:

2x-(x+1)-(21)=0

We get rid of parentheses

2x-x-1-21=0

We add all the numbers together, and all the variables

x-22=0

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

x=22

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