add the following algebraic expressions 3/4x³-1/2y³ and 1/2x³+3/4y³
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3/4x³-1/2y³ + 1/2x³+3/4y³
3/4x³-2/4y³ + 2/4x³+3/4y³
5/4x³+1/4y³
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