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16k+21=6k+84
We simplify the equation to the form, which is simple to understand
16k+21=6k+84
We move all terms containing k to the left and all other terms to the right.
+16k-6k=+84-21
We simplify left and right side of the equation.
+10k=+63
We divide both sides of the equation by 10 to get k.
k=6.3
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