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25=9-k
We move all terms to the left:
25-(9-k)=0
We add all the numbers together, and all the variables
-(-1k+9)+25=0
We get rid of parentheses
1k-9+25=0
We add all the numbers together, and all the variables
k+16=0
We move all terms containing k to the left, all other terms to the right
k=-16
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