X+x-9=X+10

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Solution for X+x-9=X+10 equation: 



X+X-9=X+10

We move all terms to the left:

X+X-9-(X+10)=0

We add all the numbers together, and all the variables

2X-(X+10)-9=0

We get rid of parentheses

2X-X-10-9=0

We add all the numbers together, and all the variables

X-19=0

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

X=19

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