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4. Zxax215x+1820 5. x4x311x2+9x+1830 6. x37x2+6>0 7. x4 + 3x3 - 2x2 -16x+16 5. x4x3 +18 <0 7. -x4+ - 16 <0 8. + +18
4. Zxax215x+1820 5. x4x311x2+9x+1830 6. x37x2+6>0 7. x4 + 3x3 - 2x2 -16x+16
5. x4x3 +18
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