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1. 5x²+ 9x-10 and 3x²-2
2. x-y, y-z and z-x
3. p-q+pq, q-r + qr, and r-p + pr
4. 3ab+5bc -4ac,9ac- 4ab+3bc,and-7bc-3ac+5ab
5. 5x²+6y²- 2z² and -7x²-5y²+3z²
6. 3ľ² - m², 2m²- 4n², and 2n² - ľ²
7. 3x²y²- 4y²z²+2x²z², -5x²z²-7x²y², and -5y²z²+8x²z² - 6x²y²
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