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k=20/42
We move all terms to the left:
k-(20/42)=0
We add all the numbers together, and all the variables
k-(+20/42)=0
We get rid of parentheses
k-20/42=0
We multiply all the terms by the denominator
k*42-20=0
Wy multiply elements
42k-20=0
We move all terms containing k to the left, all other terms to the right
42k=20
k=20/42
k=10/21
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