9=2u-1

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Solution for 9=2u-1 equation: 



9=2u-1

We move all terms to the left:

9-(2u-1)=0

We get rid of parentheses

-2u+1+9=0

We add all the numbers together, and all the variables

-2u+10=0

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

-2u=-10

u=-10/-2

u=+5

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