Check out this detailed article on Integrating Google Analytics with Marketo that outlines various available OOTB integrations Marketo has with GA and some of the baseline requirements (e.g., a proper UTM parameter strategy) required to see the Marketo data in GA. You can also add the GA tracking code to your LP templates before the closing <body> tag. Check out this article as well if you're also using Web Personalization (formerly RTP) module and wish to bring that data into GA.
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