X+9=13-x

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Solution for X+9=13-x equation: 



X+9=13-X

We move all terms to the left:

X+9-(13-X)=0

We add all the numbers together, and all the variables

X-(-1X+13)+9=0

We get rid of parentheses

X+1X-13+9=0

We add all the numbers together, and all the variables

2X-4=0

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

2X=4

X=4/2

X=2

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