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25=7+k-12
We move all terms to the left:
25-(7+k-12)=0
We add all the numbers together, and all the variables
-(k-5)+25=0
We get rid of parentheses
-k+5+25=0
We add all the numbers together, and all the variables
-1k+30=0
We move all terms containing k to the left, all other terms to the right
-k=-30
k=-30/-1
k=+30
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