9=1-2u

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Solution for 9=1-2u equation: 



9=1-2u

We move all terms to the left:

9-(1-2u)=0

We add all the numbers together, and all the variables

-(-2u+1)+9=0

We get rid of parentheses

2u-1+9=0

We add all the numbers together, and all the variables

2u+8=0

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

2u=-8

u=-8/2

u=-4

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