X+7=18-x

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Solution for X+7=18-x equation: 



X+7=18-X

We move all terms to the left:

X+7-(18-X)=0

We add all the numbers together, and all the variables

X-(-1X+18)+7=0

We get rid of parentheses

X+1X-18+7=0

We add all the numbers together, and all the variables

2X-11=0

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

2X=11

X=11/2

X=5+1/2

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