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21+3=3+k
We simplify the equation to the form, which is simple to understand
21+3=3+k
We move all terms containing k to the left and all other terms to the right.
-1k=+3-21-3
We simplify left and right side of the equation.
-1k=-21
We divide both sides of the equation by -01 to get k.
k=21
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