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Find the sum. Long gone out of my mind

Find the sum. Long gone out of my mind-example-1

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4r {}^(3) s - rs + 7r {}^(3) s + 8rs - 3 + 8rs + 6 \\ add \: \: terms \: \: of \: \: same \: \: variables \\ 11r {}^(3) s + 15rs + 3

Answer: d

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