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3+k/12=4=
We move all terms to the left:
3+k/12-(4)=0
We add all the numbers together, and all the variables
k/12-1=0
We multiply all the terms by the denominator
k-1*12=0
We add all the numbers together, and all the variables
k-12=0
We move all terms containing k to the left, all other terms to the right
k=12
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