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Since there are 7 carbons in a chain (the carbon in the parenthesis is a substituent), we know the chain is a heptane. Now, the substituent only contains one carbon, so therefore it is a methyl group. If we go from right to left, we get 5-methyl-heptane, but from left to right, we get 3-methyl-heptane. Using the rule when there is one substituent, we put the lowest number onto this substituent, so the answer is 3-methyl-heptane.
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