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2.1k=12.81
We simplify the equation to the form, which is simple to understand
2.1k=12.81
We move all terms containing k to the left and all other terms to the right.
+2.1k=+12.81
We simplify left and right side of the equation.
+2.1k=+12.81
We divide both sides of the equation by 2.1 to get k.
k=6.1
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