X+18=18-x

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Solution for X+18=18-x equation: 



X+18=18-X

We move all terms to the left:

X+18-(18-X)=0

We add all the numbers together, and all the variables

X-(-1X+18)+18=0

We get rid of parentheses

X+1X-18+18=0

We add all the numbers together, and all the variables

2X=0

X=0/2

X=0

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