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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