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12k+15=25+2k
We move all terms to the left:
12k+15-(25+2k)=0
We add all the numbers together, and all the variables
12k-(2k+25)+15=0
We get rid of parentheses
12k-2k-25+15=0
We add all the numbers together, and all the variables
10k-10=0
We move all terms containing k to the left, all other terms to the right
10k=10
k=10/10
k=1
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