X+1+x+2=21

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



X+1+X+2=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

2X-18=0

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

2X=18

X=18/2

X=9

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