Evaluate the double integral 
for the given function f(x, y) and the region R.
f(x, y) = 2y + 3x; R is the rectangle defined by 
Definitions:
Acellular
Consisting of, or pertaining to, non-cellular structure, lacking cells.
Viruses
Microscopic infectious agents that replicate only inside the living cells of organisms, capable of causing a wide range of diseases.
Photosynthetic Bacteria
Bacteria capable of photosynthesis, a process that converts light energy into chemical energy, thereby producing oxygen as a by-product, crucial for earth's oxygen supply.
Chemosynthetic Bacteria
Microorganisms that obtain energy by converting inorganic molecules to organic matter, independent of sunlight.
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