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25=2k-9
We move all terms to the left:
25-(2k-9)=0
We get rid of parentheses
-2k+9+25=0
We add all the numbers together, and all the variables
-2k+34=0
We move all terms containing k to the left, all other terms to the right
-2k=-34
k=-34/-2
k=+17
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