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k/4+5=21
We move all terms to the left:
k/4+5-(21)=0
We add all the numbers together, and all the variables
k/4-16=0
We multiply all the terms by the denominator
k-16*4=0
We add all the numbers together, and all the variables
k-64=0
We move all terms containing k to the left, all other terms to the right
k=64
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