X+x-1=21

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Solution for X+x-1=21 equation: 



X+X-1=21

We move all terms to the left:

X+X-1-(21)=0

We add all the numbers together, and all the variables

2X-22=0

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

2X=22

X=22/2

X=11

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