X+x+1=10+11

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Solution for X+x+1=10+11 equation: 



X+X+1=10+11

We move all terms to the left:

X+X+1-(10+11)=0

We add all the numbers together, and all the variables

X+X+1-21=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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