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1 solution
http://www.chemguide.co.uk/basicorg/isomerism/ez.html
As described by website above: "Does it matter that the two systems will sometimes give different results? No! The purpose of both systems is to enable you to decode a name and write a correct formula. Properly used, both systems will do this for you - although the cis-trans system will only work for very straightforward molecules."
As this is not a straightforward molecule, while ethyl is of higher priority than methyl on L.H.S. and methyl is also of higher priority than hydrogen on R.H.S., branches of higher priorities are on the same side; therefore the molecule is of Z isomerism.