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12x³-16x²y+9xy²-48x²y+64xy²-36y³
12x³-16x²y-48x²y+9xy²+64xy²-36y³
12x³-64x²y+75xy²-36y³
2.(2r - 7s) - (r - 2s) ( r - 2s)
2r²-4rs-7rs+9s² ( r - 2s)
2r³-4rs²-7r²s+9rs²-4r²s+8rs²+14rs²-18s³
2r³-4rs²+14rs²+8rs²+9rs²-7r²s-4r²s-18s³
2r³+27rs²-11r²s-18s³