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25=k/21
We move all terms to the left:
25-(k/21)=0
We add all the numbers together, and all the variables
-(+k/21)+25=0
We get rid of parentheses
-k/21+25=0
We multiply all the terms by the denominator
-k+25*21=0
We add all the numbers together, and all the variables
-1k+525=0
We move all terms containing k to the left, all other terms to the right
-k=-525
k=-525/-1
k=+525
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