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= -2x²-3x²+5x-2x+x³-15
= -5x²+3x+x³-15
b.y³+4y²+16y+4y²+16+64
= 4y²+4y²+16y+16y+y³+64
= 8y²+32y+y³+64
c.2x³+2x²y+2xy²+x²y+xy²+y³
= 2x²y+x²y+2xy²+xy²+2x³+y³
= 3x²y+3xy²+2x³+y³
itu caranya ya:)