If $6 \cdot 2k = 72$, what is the value of $2k-4$?

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Solve for $k$. $$6 \cdot 2k = 72$$ $$2k=12$$ $$k=6$$ Substitute our value of $k$ into the expression $2k-4$. $$2k-4$$ $$2(6)-4$$ $$12-4$$ $$8$$

We can reduce the number of steps by recognizing that $2k$ is present in the initial equation and final expression. $$6 \cdot 2k = 72$$ $$2k=12$$ Subtract 4 from both sides. $$2k-4=12-4$$ $$2k-4=8$$