X=20-u

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Solution for X=20-u equation: 



X=20-X

We move all terms to the left:

X-(20-X)=0

We add all the numbers together, and all the variables

X-(-1X+20)=0

We get rid of parentheses

X+1X-20=0

We add all the numbers together, and all the variables

2X-20=0

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

2X=20

X=20/2

X=10

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