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-1/3k=2/21
We move all terms to the left:
-1/3k-(2/21)=0
Domain of the equation: 3k!=0We add all the numbers together, and all the variables
k!=0/3
k!=0
k∈R
-1/3k-(+2/21)=0
We get rid of parentheses
-1/3k-2/21=0
We calculate fractions
There is no solution for this equation
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