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Mathematics, 20.08.2019 00:30 riiahh22

10. 4xy – 6xy + 5y - 9x
12. -5f-7g + f-5g - 4 +f
14. 6n2 - 2n - 3 + 5n2 - 9n - 6
16. -12x²y – 3x²y
18. 19x²y – 4xy² + 5xy² – 16x²y

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10. 4xy – 6xy + 5y - 9x
12. -5f-7g + f-5g - 4 +f
14. 6n2 - 2n - 3 + 5n2 - 9n - 6
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