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k1/3=21/3
We move all terms to the left:
k1/3-(21/3)=0
We add all the numbers together, and all the variables
k1/3-7=0
We multiply all the terms by the denominator
k1-7*3=0
We add all the numbers together, and all the variables
k-21=0
We move all terms containing k to the left, all other terms to the right
k=21
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