Question: I understand the entire problem except the last step to get the final answer. I think Im forgetting how to do algebra. Can you please

I understand the entire problem except the last step to get the final answer. I think Im forgetting how to do algebra. Can you please remind me?
 I understand the entire problem except the last step to get

It take 42 minutes for the concentration of a reactant in a first order reaction to drop from 0.45M to 0.32M at 25C. How long will it take for the reaction to be 90% complete

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