9=2k-1

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Solution for 9=2k-1 equation: 



9=2k-1

We move all terms to the left:

9-(2k-1)=0

We get rid of parentheses

-2k+1+9=0

We add all the numbers together, and all the variables

-2k+10=0

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

-2k=-10

k=-10/-2

k=+5

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