X=25-u

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Solution for X=25-u equation: 



X=25-X

We move all terms to the left:

X-(25-X)=0

We add all the numbers together, and all the variables

X-(-1X+25)=0

We get rid of parentheses

X+1X-25=0

We add all the numbers together, and all the variables

2X-25=0

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

2X=25

X=25/2

X=12+1/2

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