x+x+1+x+2=21

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Solution for x+x+1+x+2=21 equation: 



x+x+1+x+2=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x-18=0

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

3x=18

x=18/3

x=6

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