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13=2k-5
We move all terms to the left:
13-(2k-5)=0
We get rid of parentheses
-2k+5+13=0
We add all the numbers together, and all the variables
-2k+18=0
We move all terms containing k to the left, all other terms to the right
-2k=-18
k=-18/-2
k=+9
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