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k+15=25-k
We move all terms to the left:
k+15-(25-k)=0
We add all the numbers together, and all the variables
k-(-1k+25)+15=0
We get rid of parentheses
k+1k-25+15=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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