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That's not possible to simplify, or give an answer to, unless you know what 'r' is.
It simplifies to: 2s+4R
r + s = 4 and 2r + 3s = 8 multiply the first equation by 2 giving 2r + 2s = 8 subtract this from the second equation giving s = 0 So r = 4 and s = 0.
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since you do not know what r and s is all you need to write is... 2r + 2s the sum just simply means add them together.