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1-2k=1-2k

We move all terms to the left:

1-2k-(1-2k)=0

We add all the numbers together, and all the variables

-2k-(-2k+1)+1=0

We get rid of parentheses

-2k+2k-1+1=0

We add all the numbers together, and all the variables

=0

k=0/1

k=0

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