How do i merge 2 partitions on Lion os x?

The Bootcamp utility you used to create the partition can also remove it.

 

This might help (an all-inclusive guide for basic Disk Utility use)

 

delete the windows 7 partion in disk utility by highlighting it and hit the minus symbol onces its deleted it will just be a grey area, than you can drag the bottom corner of your OSX partion to fill the entire drive than hit apply

 

Removing the BootCamp partition

Open Boot Camp Assistant (Applications / Utilities /) and remove the Windows partition.
Here is a guide in images (which have to be clicked in order to see the full resolution, as they are too big for this thread):

Open Boot Camp Assistant via Spotlight (or any other means you prefer)

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Press Continue

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Select the shown selection

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Select the shown selection

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Select the disk with the Boot Camp partition if you have more than one disk inside your Mac and then select the shown selection

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Press Restore

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Enter your admin account password

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See the partitioning progress, it can take some minutes depending on the size of the Windows partition and if you have an SSD (faster) or HDD (slower)

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Boot Camp partition has been successfully removed, you can quit Boot Camp Assistant if you want

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